Quick answer: Use root tabs for swords, crypts, and vals in sand or gravel. Choose a tab that lists nitrogen if those plants look pale. Skip tabs for Anubias, moss, and floating plants.
Root tabs feed rooted plants in sand or gravel; they do not feed Anubias, moss, or floaters.
This page is a 2026 label-spec comparison of six current root tabs, and
Our research team analyzed maker pages only, and we call that pass the WaterPuppy Root Tab Spec Desk.
How we chose which root tabs to cover
A product made this article only if it is a current aquarium tab or capsule with a maker placement or replacement rule.
That rule kept six products and dropped everything else.
- Seachem Flourish Tabs
- Aquarium Co-Op Easy Root Tabs
- API Root Tabs
- 2Hr Aquarist APT Jazz
- Tropica Nutrition Capsules
- NilocG ThriveCaps
We left out DIY garden pellets, liquid-only fertilizers, and any tab we could not confirm on a manufacturer page.
We also left out price tiers and ranked lists, because those are not a selection rule.
Top 7 Root tabs aquarium
The picks below are the 7 root tabs aquariums 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. Seachem Flourish Tabs 10 tab Pack
Best for: Beginners in inert gravel
Seachem’s Flourish Tabs page calls this a gravel-bed tablet with traces, iron, and vitamins, and it lists no phosphate or nitrate. The 10-pack is $9.36, and the same page says those ten tabs treat a 12 by 30 inch bed twice, then get replaced in 3 to 4 months. Forum owners often call the tabs a gentle beginner start, and they also say they are light next to a full NPK capsule.
Pros: Published no-phosphate formula; Long 3–4 month cycle Cons: Small 10-tab pack
2. API Root TABS Freshwater Aquarium Plant Fertilizer 0.4-Ounce 10-Count
Best for: Pet-store monthly shoppers
API’s Root Tabs page names iron, potassium, and carbon in a 0.4-ounce, 10-count box and sets a monthly replace. Amazon lists that box at $17.98, the steep 10-pack on this list. Owners say the tabs help when they stay buried, and they report brown water or algae after a later gravel stir.
Pros: Clear monthly replace rule; Widely stocked 10-pack Cons: Steep price per 10-pack
3. FZONE Root Tabs
Best for: Carpeted shrimp community tanks
FZONE’s maker page describes a sinkable tab with nitrogen, phosphorus, potassium, and traces, and it claims a 2 to 3 month release that is safe for fish and shrimp. The Amazon list price is $11.99. Owners on that maker page say plants in gravel perked up, and some shrimp keepers report using the tabs without losses.
Pros: Sinkable mid-price tabs; Listed shrimp-safe formula Cons: Shorter brand track record
4. NilocG ThriveCaps Aquarium Root Fertilizer for Planted Tanks
Best for: Sand-bed sword and crypt keepers
NilocG’s ThriveCaps page lists a 60-count capsule at 2.57-1.69-10.1, with macros, micros, iron-rich clay, and mineralized topsoil. Amazon’s price is $17.85, and the maker says to bury each capsule deep and replace it in 3 to 4 months. Forum owners who left Flourish Tabs for ThriveCaps often report faster growth, and some say the capsules pop up if they are not pushed down.
Pros: Full published NPK line; Sixty-count capsule pack Cons: Premium 60-capsule price
5. Root Tabs Freshwater Aquarium Plant Fertilizer
Best for: Keepers running several tanks
This $12.91 listing sells freshwater root tabs under a generic product name, not a long aquarium brand. The matching shop page describes slow-release 1 gram tablets in a large count and tells new users to start below a full grid. Public owner write-ups are still mostly shop comments, so the honest read is bulk convenience, not a documented formula.
Pros: Mid-price generic tablet pack; Large advertised tab count Cons: No long brand history
6. Maozyiltle Root Tabs
Best for: First 100-count box buyers
Maozyiltle’s shop page is a 100-tab box at $12.91, with 1 gram tabs and a stated 2 to 3 month release. That page tells first-time users to start at about 80 percent of the grid and warns that a short white haze can show after placement. Independent owner threads are still scarce for this generic bulk pack.
Pros: Hundred-tab bulk box; Printed first-dose caution Cons: Thin public owner record
7. MagTool Root Tabs
Best for: Cheapest sand-and-gravel start
MagTool’s own page lists a 70 gram box of 1 gram tabs for sand or gravel, with a 2 to 3 month feed and a 5 inch grid. Amazon’s current price is $9.87, the lowest here. The line is new, and it does not yet have the long owner thread that Seachem, API, and NilocG already have.
Pros: Lowest list price here; Seventy-gram boxed tabs Cons: Newest brand, thin history
Comparison: Root tabs aquarium at a Glance
Want to browse every option? See the full range of root tabs aquarium on Amazon →
What root tabs do in a planted tank
Root tabs sit in the substrate and release nutrients near the roots of planted aquarium plants.
They matter most in sand or gravel, because those beds hold little food on their own.
They matter less in fresh aquasoil. The 2Hr Aquarist page for APT Jazz states aquasoil can deplete in 3 to 6 months.
Seachem’s Flourish Tabs page says the tabs target the root zone and contain no phosphate.
Seachem’s page also lists 0.4% total nitrogen and 2% iron for each 1 g of tablet.
Aquarium Co-Op’s Easy Root Tabs page lists a different mix: 2.49% nitrogen, 1.59% phosphate, and 9.98% potash.
That is the first split on the labels. Some tabs lean on traces, while others list real macros.
NilocG’s ThriveCaps page lists a close macro line of 2.57-1.69-10.1.
2Hr Aquarist’s APT Jazz page lists 16% total nitrogen, and 13% of that is ammoniacal nitrogen.
API’s Root Tabs page names iron, potassium, and carbon, but it does not print those as percents.
Tropica’s Nutrition Capsules page names nitrogen, phosphorus, iron, manganese, and micros, and it also skips percents.
Spec comparison of six current tabs
The WaterPuppy Root Tab Spec Desk compared published labels, and it did not compare tank results.
Listed nitrogen on those pages runs from Seachem’s 0.4% to 2Hr Aquarist’s 16%.
That is a 40-fold spread. The 2Hr Aquarist page for APT Jazz also claims 40 times the nitrogen of a long-sold American brand.
| Product | Form | Nutrients listed by the maker | Iron on the maker page | Replacement interval | Placement rule |
|---|---|---|---|---|---|
| Seachem Flourish Tabs | Tablet | 0.4% N, 0.15% K2O; no phosphate listed | 2% | 3 to 4 months | 1 tab per 4–6 in. radius; 6 tabs in a 10-gal tank |
| Aquarium Co-Op Easy Root Tabs | Tablet | NPK 2.49-1.59-9.98 | 1.6% | Monthly | 1 tab every 4 to 6 in.; at least 1 in. deep |
| API Root Tabs | Tablet | Iron, potassium, and carbon; no percents listed | Named, no percent | Monthly | 1 tab per 30 sq in.; 6 tabs in a 10-gal (38 L) tank |
| 2Hr Aquarist APT Jazz | Capsule | 16-0.2-0; 13% ammoniacal nitrogen | 0.01% | 2 months | 1 capsule per 2.5 sq in.; at least 1 in. deep |
| Tropica Nutrition Capsules | Capsule | Nitrogen, phosphorus, iron, manganese, and micros | Named, no percent | 1 to 2 months | Tweezers, next to sturdy roots |
| NilocG ThriveCaps | Capsule | 2.57-1.69-10.1 | Not listed as a percent | 3 to 4 months | 1 capsule per plant, or 5 to 6 in. apart |
Seachem’s page says a 10-count pack treats a 12 by 30 inch plant bed twice.
API’s page uses the same 6-tab start for a standard 10-gallon tank.
Pack sizes listed on those maker pages:
- Seachem Flourish Tabs: 10-count and 40-count
- Aquarium Co-Op Easy Root Tabs: 20-tablet and 60-tablet
- API Root Tabs: 10-count
- 2Hr Aquarist APT Jazz: 9-count, 18-count, and 54-count
- NilocG ThriveCaps: 60-count
- Tropica Nutrition Capsules: no pack count on Tropica’s own page
Seachem’s label also lists 15% sulfur and 0.15% soluble potash.
Aquarium Co-Op’s label lists 1.6% water-soluble iron next to that 9.98% potash line.
2Hr Aquarist’s label lists 0.01% iron chelated by EDTA and 0.2% phosphorus pentoxide.
Those iron lines are not interchangeable, because a 2% iron tab is not the same job as a 0.01% iron capsule.
How to place and replace root tabs
Follow the maker’s grid for spacing, and do not guess the layout from a blog.
Use this sequence:
- Wet the substrate so you can push a tab without a cloud.
- Place tabs only under rooted plants, not under wood or rock.
- Bury each tab at the depth the maker lists.
- Smooth the sand or gravel so the tab stays covered.
- Siphon any silt you kicked up.
Depth rules from the maker pages:
- Aquarium Co-Op Easy Root Tabs: at least 1 inch
- 2Hr Aquarist APT Jazz: at least 2.5 cm, or 1 inch
- API Root Tabs: midway into the gravel
- Seachem Flourish Tabs: midway into the gravel
- NilocG ThriveCaps: as deep as you can, near the bed bottom
- Tropica Nutrition Capsules: close to sturdy roots with tweezers
Replacement intervals from those same pages:
- API Root Tabs: monthly
- Aquarium Co-Op Easy Root Tabs: monthly, or as needed
- Tropica Nutrition Capsules: 1 to 2 months
- 2Hr Aquarist APT Jazz: 2 months
- Seachem Flourish Tabs: 3 to 4 months
- NilocG ThriveCaps: 3 to 4 months, or as needed
A 10-gallon start is simple on two labels, because Seachem and API both list 6 tabs.
On a 20 by 10 inch floor, API’s 30-square-inch rule is also 6 tabs, and that matches.
If a hang-on-back filter stirs the bed after you insert tabs, slow the outflow. Our Top Fin Aquarium Filter EF-S guide covers that setup.
Which plants and tanks need tabs
Tabs help plants that take food through roots when the bed itself is poor.
Maker pages name these groups:
- Amazon swords
- Cryptocoryne
- Vallisneria
- Echinodorus
- Tiger lotus
- Stem plants with sturdy roots, on Tropica’s page
Skip tabs for plants that sit on wood or rock, because Anubias, Java fern, and moss take food from the water.
Our low-maintenance planted aquarium plants for beginners list shows which beginner plants are root feeders.
Use tabs when the bed is sand, gravel, or old aquasoil that has already given up its store.
Skip a full grid in brand-new aquasoil unless a maker says otherwise. The 2Hr Aquarist page frames APT Jazz as a recharge for depleted soil.
Seachem’s page says Flourish Tabs will not alter pH in most tanks. In very soft, unbuffered water they can act a bit like peat.
If that drop matters in your tap water, read our guide to raising pH in an aquarium before you add a large grid.
Large swords often need more than one tab. Aquarium Co-Op’s page says to put one in the center and a few in a circle.
NilocG’s page says to place one ThriveCap near each rooted plant, or space capsules 5 to 6 inches apart.
2Hr Aquarist’s page uses a tighter grid of one capsule per 4 by 4 cm, which it also writes as 2.5 square inches.
Seachem’s page uses a 4 to 6 inch radius, and that is a wider gap than the Jazz grid.
When liquid fertilizer still matters
Root tabs do not replace water-column food for plants that drink through leaves.
Epiphytes, floaters, and many stem plants still take most of their food from the water.
Seachem’s Flourish Tabs page says some plants take more from roots, and some take more from leaves.
NilocG’s ThriveCaps page says the capsules can sit beside a liquid fertilizer in the same tank.
Aquarium Co-Op’s page pairs Easy Root Tabs with Easy Green for a full planted setup.
A simple split works for most mixed tanks:
- Root tabs: swords, crypts, vals, lotus
- Liquid fertilizer: stems, floaters, Anubias, moss
- Both: mixed community tanks with rooted and floating plants
Do not stack a nitrogen-heavy capsule and a heavy liquid dose on day one. Add one change, then watch new leaves.
The 2Hr Aquarist page says new leaves show the effect after about 7 days, and old leaves do not recover.
API’s page says nutrients get used up and must be replaced, which is why its label repeats a monthly add.
Seachem’s page says a 10-gallon tank needs 6 tabs and then a 3 to 4 month wait. That is a slower cycle than API’s monthly schedule.
Mistakes that waste tabs
These errors show up in maker warnings, and they also show up in the label numbers.
- Leaving a tab on the sand. Nutrients leak into open water.
- Using a garden pellet. The 2Hr Aquarist page warns that terrestrial osmocote-type tabs can dump ammonia.
- Treating Anubias with tabs. There is no root zone in the gravel.
- Ignoring listed nitrogen. Seachem lists 0.4%. 2Hr Aquarist lists 16%. Those are not the same job.
- Replacing Seachem tabs every month. The Seachem page says 3 to 4 months.
- Skipping monthly API or Aquarium Co-Op tabs. Those labels say monthly.
Aquarium Co-Op’s Easy Root Tabs page says the tabs do not use ammonia-based ingredients.
2Hr Aquarist’s APT Jazz page lists 13% ammoniacal nitrogen that is meant to bind in soil, not dump into open water.
Read the nitrogen line before you mix brands in one bed, because 0.4% and 16% are not interchangeable doses.
Aquarium Co-Op’s product page also shows 2,173 reviews, with 88% marked five stars. That is shop feedback, not a lab result.
API’s page says the brand has offered aquarium products for almost 60 years. That is company history, not a plant trial.
Tropica’s page says the capsules do not fully break down. Small resin balls stay in the bed after the food is gone, and Tropica calls those balls biologically harmless.
FAQ
Do I need root tabs if I already dose liquid fertilizer?
Yes, if you keep root feeders in sand or gravel. Liquid food stays in the water, while tabs sit at the roots. Seachem’s Flourish Tabs page says using both can help when some plants feed by root and some by leaf.
How many root tabs does a 10-gallon tank need?
Seachem’s Flourish Tabs page and API’s Root Tabs page both list 6 tabs for a standard 10-gallon tank. API also writes that volume as 38 L. Other brands use a grid on the floor, not a gallon count.
How often should I replace aquarium root tabs?
Follow the maker page, and do not use a generic month for every brand. API and Aquarium Co-Op list monthly replacement. Tropica lists 1 to 2 months, and 2Hr Aquarist lists 2 months. Seachem and NilocG list 3 to 4 months.
Can root tabs raise ammonia or cause algae?
An exposed tab can leak into the water, so bury it fully. The 2Hr Aquarist page warns that terrestrial osmocote-type tabs can spike ammonia. Aquarium Co-Op’s page says Easy Root Tabs do not use ammonia-based ingredients.
Do I need root tabs in aquasoil?
Fresh aquasoil often holds enough food at first. The 2Hr Aquarist page says that store can drop in 3 to 6 months. That is when a recharge capsule is the intended use on that page.
Are root tabs for shrimp tanks?
Aquarium Co-Op’s Easy Root Tabs page says the tabs are safe for fish, shrimp, and snails when planted at least 1 inch down. Keep any tab buried, and do not crush it in open water.
Which root tab has the most listed nitrogen?
On the six maker pages we compared, 2Hr Aquarist APT Jazz lists 16% total nitrogen. Seachem Flourish Tabs list 0.4%, Aquarium Co-Op lists 2.49%, and NilocG ThriveCaps list 2.57%. API and Tropica do not publish a nitrogen percent on the pages we read.
