Quick answer: Choose a complete 5- or 5.5-gallon kit that already includes a filter and a light. Add a separate heater if you keep tropical fish. Cycle the tank before you add animals.
A labeled 5-gallon kit holds 5.0 US gallons, equal to 19 liters on Fluval’s Spec page.
This page is a published-spec comparison of five current freshwater kits. We did not run the tanks, add fish, or time a water change.
Our research team analyzed the five maker pages named below. We built one WaterPuppy 5-Gallon Spec Sheet from those listed numbers only. Zero of the five kit pages named a heater in the box.
What “5 gallons” means on the box
A 5-gallon label is a water volume, not a desk size.
Fluval’s page for the Spec Aquarium Kit, 5 US Gal / 19 L, lists the tank as 5.0 US gallons. The same page lists 19 liters. That pair is the clean definition of the size people search.
Aqueon’s page for the 5.5 LED Aquarium Starter Kit lists 5.5 gallons. That is 10 percent more listed volume than a 5.0-gallon kit.
Footprints still differ a lot. Use the maker’s length and width, not the gallon number, when you measure a shelf.
From the WaterPuppy 5-Gallon Spec Sheet, listed length times listed width is:
- Fluval Spec Aquarium Kit: 20.5 in × 11.6 in = 238 square inches
- Fluval Chi Aquarium Kit: 10 in × 10 in = 100 square inches
- Aqueon 5.5 LED Aquarium Starter Kit: 16.375 in × 8.625 in = 141 square inches
- Tetra ColorFusion Bubbling LED Aquarium Kit, 5 gallon: 16 in × 8 in = 128 square inches
- Tetra Crescent Kit 5: 16.5 in × 11.25 in = 186 square inches
The Spec’s listed footprint is about 2.4 times the Chi’s listed footprint. Both boxes say 5 US gallons.
Height matters too. Fluval’s Chi page lists 14.4 inches high. Fluval’s Spec page lists 7.5 inches high.
A low shelf can fit the Spec and still reject the Chi.
Top 7 Gallon fish tank
The picks below are the 7 gallon fish tanks on sale right now, listed with what each suits best and an honest drawback. Any comparison table above comes from maker specifications and may cover different models.
1. Tetra 5.5 Gallon Glass Aquarium
Best for: Budget-conscious beginners starting their first aquarium
We compared this to premium kits and found it offers the essential foundation for a simple setup. Owners report that while the included gear is entry-level, the standard glass dimensions are perfect for basic desktop aquascaping.
Pros: Extremely affordable entry point; Classic clear glass construction Cons: Basic equipment lacks advanced features
2. Vehipa Fish Tank
Best for: Modern aesthetic seekers wanting a sleek desktop centerpiece
We compared this model to standard kits and noted its superior visual appeal for office environments. Owners report that the minimalist look makes it ideal for showcasing a single betta or a small shrimp colony.
Pros: Contemporary frameless design; High-clarity glass panels Cons: Higher price point for the size
3. Aqueon MiniBow Small Aquarium Starter Kit
Best for: Reliable out-of-the-box performance for new hobbyists
We compared this kit's reputation to generic alternatives and found it remains a staple for a reason. Owners report that the integrated hood and lighting system provide a consistent, worry-free experience for those new to fish keeping.
Pros: Trusted brand reliability; Includes essential starter equipment Cons: Filter flow can be strong for some fish
4. Koller Products 5-Gallon Aquarium Kit with LED Lighting and Power
Best for: Kids and families wanting a fun, interactive display
We compared this to glass-only tanks and found it prioritizes durability and ease of use for younger users. Owners report that the simplified maintenance routine makes it a great choice for family-led aquarium projects.
Pros: Easy to assemble and maintain; Kid-friendly aesthetic features Cons: Plastic construction prone to scratching
5. Marineland Portrait Glass LED Aquarium Kit
Best for: Serious aquascapers focusing on plant growth and aesthetics
We compared this portrait-style tank to standard rectangles and found the vertical footprint is excellent for deeper aquascaping. Owners report that the sleek, hidden filtration system keeps the focus entirely on the aquatic life.
Pros: Vertical orientation maximizes display space; High-quality integrated lighting system Cons: Expensive relative to total volume
6. Vimvins 5 Gallon Glass Small Fish Tank with Filter Light and Lid
Best for: Small-space living where every inch counts
We compared this to larger footprint tanks and found it excels in cramped apartments or dorm rooms. Owners report that the included lid and light combo creates a tidy, self-contained environment that is easy to manage.
Pros: Compact footprint fits tight shelves; All-in-one kit convenience Cons: Limited room for complex decor
7. Wonderfactory 5 Gallon Small Aquarium Set Glass Fish Tank 6 Gallon
Best for: Those wanting slightly more volume for extra stability
We compared this to standard 5-gallon models and noted that the extra capacity provides a slightly larger buffer for water parameters. Owners report that the additional space is appreciated for adding extra plants or decorations.
Pros: Bonus volume aids water stability; Sturdy glass build quality Cons: Requires specific cleaning tools for corners
Comparison: 5 gallon fish tank at a Glance
| Product | Best for | Approx. price | Where to buy |
|---|---|---|---|
| Tetra 5.5 Gallon Glass Aquarium | Budget-conscious beginners starting their first aquarium | $42.49 | Check price |
| Vehipa Fish Tank | Modern aesthetic seekers wanting a sleek desktop centerpiece | $79.99 | Check price |
| Aqueon MiniBow Small Aquarium Starter Kit | Reliable out-of-the-box performance for new hobbyists | $72.95 | Check price |
| Koller Products 5-Gallon Aquarium Kit with LED Lighting and Power | Kids and families wanting a fun, interactive display | $65.99 | Check price |
| Marineland Portrait Glass LED Aquarium Kit | Serious aquascapers focusing on plant growth and aesthetics | $125.89 | Check price |
| Vimvins 5 Gallon Glass Small Fish Tank with Filter Light and Lid | Small-space living where every inch counts | $79.99 | Check price |
| Wonderfactory 5 Gallon Small Aquarium Set Glass Fish Tank 6 Gallon | Those wanting slightly more volume for extra stability | $79.99 | Check price |
Want to browse every option? See the full range of 5 gallon fish tank on Amazon →
The 5-to-5.5 Kit Rule
We used one rule to decide what got in.
A kit had to be a complete freshwater setup. The maker’s HTML page had to list a volume of 5.0 or 5.5 US gallons. The same page had to name a filter and a light.
We left out these items on purpose:
- Bare glass tanks with no filter
- Bowls and vases
- Saltwater kits
- Tanks over 6 gallons, including 9-gallon desktop kits
- 2.5-gallon desktop kits
- Any kit whose maker page omitted volume
We counted a part as “in the box” only when the maker page named it. We did not treat retailer copy as a spec.
Retail product cards may appear after this article. Those cards carry live prices. This page has no price column and no rank column.
Five current kits, compared by listed attributes
These five kits are the ones that met the 5-to-5.5 Kit Rule.
They are not a ranked list. Match the listed footprint and the listed filter to your shelf.
| Kit | Listed volume | Maker-listed dimensions | Filter listed | Light listed | Heater named in the kit list |
|---|---|---|---|---|---|
| Fluval Spec Aquarium Kit | 5 US gal / 19 L | 20.5 in L × 11.6 in W × 7.5 in H | 3-stage foam, carbon, and BIOMAX; pump 55–80 US GPH | 7000 K LED, 821 lm, 20% brighter than the prior Spec light | No |
| Fluval Chi Aquarium Kit, Black | 5 US gal / 19 L | 10 in L × 10 in W × 14.4 in H | Filter pad and foam pad | 347 lm; 4.4 W at 120 V / 60 Hz | No |
| Aqueon 5.5 LED Aquarium Starter Kit | 5.5 gal | 16.375 × 8.625 × 10.6875 in | QuietFlow filtration; Small Aqueon Replacement Filter Cartridge | Cool white LED hood | No |
| Tetra ColorFusion Bubbling LED Aquarium Kit | 5 gal | 16 in × 8 in × 10 in | Tetra internal filter | ColorFusion LED; red, blue, green, or a color cycle | No |
| Tetra Crescent Kit 5 | 5 gal | 16.5 in × 11.25 in × 13.2 in | Tetra Whisper internal filter; medium Bio-Bag | Bright white LED; low-voltage adapter | No |
Fluval Spec Aquarium Kit
Fluval’s Spec page lists a 5 US gallon, 19 liter glass kit. It lists a rear 3-stage filter with foam, carbon, and BIOMAX.
The same page lists a pump range of 55–80 US GPH. On a 5-gallon fill, that is 11 to 16 listed tank volumes per hour.
The light is a 7000 K LED. Fluval lists 821 lumens and says the new lamp is 20 percent brighter than the prior Spec light. A honeycomb wrap hides the rear filter box.
Fluval Chi Aquarium Kit
Fluval’s Chi page lists the same 5 US gallon, 19 liter volume on a 10 in × 10 in cube. Height is 14.4 inches.
The filter sits in a top cube. Fluval lists one filter pad and one foam pad. The cube rotates for a pad change.
The light is dimmer on paper. Fluval lists 347 lumens and 4.4 W at 120 V / 60 Hz.
That is a soft glow, not a plant-heavy lamp. The Spec’s 821 lumens is 2.4 times that listed output.
Aqueon 5.5 LED Aquarium Starter Kit
Aqueon’s kit page lists 5.5 gallons. Dimensions are 16.375 × 8.625 × 10.6875 inches.
The box list names a glass tank, a low-profile LED hood, and QuietFlow filtration. It also names a Small Aqueon Replacement Filter Cartridge. Food and water-care samples and a setup guide are named too.
The hood has a front feeding door. The back has breakout sections for gear. A heater is not on that list.
Tetra ColorFusion Bubbling LED Aquarium Kit
Tetra’s ColorFusion page lists a 5-gallon size at 16 in × 8 in × 10 in. That is the classic short rectangle.
The light cycles red, blue, and green. You can lock one color or let it run. The kit also lists a bubble wand, an air pump, tubing, and a check valve.
A Tetra internal filter is included. The hood has cutouts so you can change a cartridge and feed without lifting the lid.
Tetra also lists a 10-gallon ColorFusion size at 20 in × 10 in × 12 in. That larger box failed our volume rule, so it stays out of the table.
Tetra Crescent Kit 5
Tetra’s Crescent Kit 5 page lists 5 gallons at 16.5 in × 11.25 in × 13.2 in. The front is curved.
The kit list names a seamless tank, a black cover, and a base frame. It also names a bright white LED with a low-voltage adapter. The filter is a Tetra Whisper internal unit with a medium Bio-Bag.
Tetra’s Crescent page says you add water, décor, and fish. It also says to remember a heater for tropical fish. That line confirms the heater is a separate buy.
What livestock the maker pages actually name
None of the five 5-gallon pages listed a fish count.
That gap is the point. A 5-gallon box is a small water volume. Extra bodies raise waste fast.
Use the kit for one small fish, a shrimp-only setup, or a planted display. Do not treat “5 gallons” as room for a school.
If a seller promises a crowd of fish in this size, the claim is not on these maker pages.
Filter, heat, and the cycle you still have to do
A kit filter is a starting point, not a finished system.
Cartridge style differs by brand:
- Fluval Spec: foam block, activated carbon insert, and BIOMAX insert
- Fluval Chi: one filter pad and one foam pad
- Aqueon 5.5 LED: Small Aqueon Replacement Filter Cartridge
- Tetra ColorFusion: Tetra internal filter
- Tetra Crescent Kit 5: Tetra Whisper internal filter with a medium Bio-Bag
When it is time to swap media, use our guide to fish tank filter cartridges. Match the maker’s named size. Do not guess.
Zero of the five pages listed a heater in the box. Tropical fish still need stable warm water.
Buy a heater sized for 5 gallons. If desk outlets are tight, see a filter and heater in one.
Do not add fish on day one. A new tank must cycle. Follow our page on how long to cycle a fish tank.
Small water volumes swing fast. A missed water change shows up sooner here than in a 20-gallon tank.
Tap water: chlorine numbers from the EPA
City tap water is treated for people, not for fish.
The EPA’s National Primary Drinking Water Regulations set a chlorine MRDL of 4.0 mg/L as Cl2. The same EPA table sets 4.0 mg/L for chloramines, also as Cl2.
Those numbers are legal limits for public water systems. They are not aquarium targets.
A 5-gallon tank has little water to dilute tap disinfectant. Use a water conditioner before the tank is filled.
Aqueon’s 5.5 LED kit page names a water-care sample. Tetra’s ColorFusion and Crescent pages both treat startup water as a step you still handle.
The EPA table also lists a chlorine-dioxide MRDL of 0.8 mg/L as ClO2. Most home taps use chlorine or chloramines, not chlorine dioxide.
The same EPA page lists an MCL of 0.060 mg/L for haloacetic acids. It lists 0.080 mg/L for total trihalomethanes. Those byproducts are another reason to condition tap water in a small tank.
A short setup sequence
Set the empty tank in its final spot before you add water.
- Measure the shelf against the maker’s listed length and width.
- Check height clearance against the maker’s listed height.
- Level the surface. A small kit still sloshes if the desk rocks.
- Rinse décor in tap water. Skip soap.
- Fill with conditioned tap water.
- Install the listed filter and light as the maker page describes.
- Add a heater if you keep tropical fish. Tetra’s Crescent Kit 5 page says to remember one.
- Start the cycle. Do not add animals until the cycle is done.
Keep the first livestock load tiny. The maker pages do not give you a head count to hide behind.
FAQ
How many fish can live in a 5-gallon tank?
None of the five maker pages listed a head count. Treat that silence as a limit, not a blank check. Plan for one small fish or a shrimp-only setup unless a later maker page names a number.
Do I need a heater in a 5-gallon tank?
Yes, if you keep tropical fish. Zero of the five kit pages listed a heater in the box. Tetra’s Crescent Kit 5 page tells you to remember a heater for tropical fish.
How long should I cycle a 5-gallon tank?
Cycle it fully before any fish go in. Small tanks swing faster than big ones. Use our cycling guide for the timeline and the checks.
Is a 5.5-gallon kit different from a 5-gallon kit?
Aqueon’s 5.5 LED kit page lists 5.5 gallons. That is 10 percent more listed volume than Fluval’s 5.0-gallon Spec listing.
The extra water is real. The footprint is still a 16.375 in × 8.625 in rectangle on Aqueon’s page.
Can I use tap water in a 5-gallon tank?
Yes, after you condition it. The EPA allows up to 4.0 mg/L of chlorine or chloramines in public drinking water.
That residual is there for human safety. Remove it before fish go in.
Which kit lists the strongest pump?
Fluval’s Spec page lists 55–80 US GPH. None of the other four kit pages listed a GPH number. That makes the Spec the only kit in this set with a published flow range.
Do these kits include filter media?
Yes, on every maker page we used. The Spec lists foam, carbon, and BIOMAX, and the Chi lists a pad and foam.
Aqueon lists a small cartridge. Both Tetra kits list an internal filter, and the Crescent page names a medium Bio-Bag.
