Quick answer: Keep one adult oranda in a filtered tank of at least 100 liters. Feed a goldfish food in short meals. Test water weekly and change 25 percent of it each week.
An adult oranda needs at least 100 liters of tank water, about 26 U.S. gallons, plus 50 liters for each extra adult. This page is a home-aquarium research brief; we did not run feeding trials, measure wen growth, or keep a lab colony.
We used one selection rule so this page stays on published tank and label numbers. We cover indoor pet orandas in filtered tanks that meet the Ornamental Aquatic Trade Association’s 100-litre adult floor.
We exclude bowls, outdoor pond-only commons, and tropical community stocking charts. For products, we only list currently sold goldfish foods whose U.S. maker pages publish a crude-protein minimum.
Our research team analyzed those published specs and did not rank foods or build a price ladder.
What an oranda is
An oranda is a fancy goldfish with a fleshy head growth called a wen, not a separate species.
The scientific name is Carassius auratus. The Ornamental Aquatic Trade Association’s goldfish care sheet uses that name for goldfish as a group.
The wen is a soft hood on the head that can sit like a cap or spread over the cheeks. It is a body form of the same fish, not a second species.
OATA’s sheet says aquarium goldfish commonly reach 25 cm, about 10 inches. Some reports on that sheet go past 40 cm.
Plan the tank for that published adult, not for the small fish in the store bag.
Tank size: the 100-liter floor
OATA’s published adult floor is 100 liters for the first fish, then 50 liters more for each extra adult.
The Ornamental Aquatic Trade Association care sheet states that rule in litres. 100 litres is about 26 U.S. gallons, and 50 litres is about 13 U.S. gallons.
We call that converted floor the 26-Gallon Adult Floor. It is a unit change, not a new study.
A filter is always essential on that same OATA sheet, and a heater is not required unless the room is very cold. Keep the tank away from drafts, heat sources, and direct sun.
OATA also says to add fish slowly after the filter has matured. Fast stocking can cause new tank syndrome, when new waste outpaces the filter bacteria.
Water numbers that protect the wen
Test every week, keep ammonia and nitrite at zero, and change 25 percent of the water weekly.
OATA lists these home targets:
- Temperature: 4 to 25°C
- pH: 6.0 to 8.0
- Ammonia: 0 mg per litre
- Nitrite: 0 mg per litre
- Nitrate: no more than 20 mg per litre above normal tap water
- Hardness: 5 to 19°dH
OATA says goldfish are very dirty, so waste can raise ammonia and nitrite fast. OATA strongly recommends a 25% partial water change at least once every week.
Treat replacement water to remove chlorine and chloramine before it goes in. Rinse filter media in old tank water, not tap water, because tap chlorine can kill the filter bacteria.
Use a test kit that reads ammonia, nitrite, nitrate, and pH. OATA calls test kits essential, not optional.
If the fish hangs at the surface or sits on the bottom, test the water the same day. OATA lists those swimming changes as warning signs.
Wen growth and what labels claim
Maker pages link high-protein diets to head form, but this desk did not measure any wen.
Hikari Sales USA’s Lionhead page names the oranda as a target fish. It says the sinking pellet lets the fish eat without rising to the surface.
That same page says the diet was made to support prominent head growth without live food. Hikari Sales USA’s Oranda Gold page makes a similar head-growth claim for a floating pellet.
We compared those published claims to the label numbers. We did not measure head size on any fish.
The wen has folds that trap waste, so dirty water is the risk, not the fold itself. Watch for redness, white patches, or leftover food sitting on the hood, and use smooth décor plus a weekly water-change habit.
Hikari Sales USA’s Oranda Gold page says the floating pellet helps orandas that do not dive easily. Hikari Sales USA’s Lionhead page says the sinking pellet keeps the fish off the surface.
Those two maker pages disagree on form, so pick one form and watch whether leftover food piles up.
Feeding: published protein, short meals
Published crude-protein minima on four current goldfish foods span 35 percent to 46 percent.
AAFCO’s labeling page says a guaranteed analysis must list minimum crude protein, minimum crude fat, maximum crude fiber, and maximum moisture. “Crude” names the lab method and does not grade the protein.
AAFCO’s page also lists eight required pet-food label items, and the guaranteed analysis is one of those eight items.
Our research team analyzed four U.S. maker pages that print those protein minima. The WaterPuppy Goldfish Label Spread is that 11-point gap from 35% to 46%.
Published protein minima:
- Hikari Lionhead: 46.0% minimum
- Hikari Oranda Gold: 45.0% minimum
- Tetra Select GoldFish Flakes: 42.0% minimum
- Omega One Goldfish Pellets Large Sinking: 35% minimum
Hikari Sales USA’s Lionhead page says to feed two or four times daily. Do not exceed what the fish eat in about a minute.
That page also says to cut the amount if water stays below 50°F or above 86°F.
Hikari Sales USA’s Oranda Gold page says two or four times daily, within a few minutes. Tetra’s Select GoldFish Flakes page says two to three times daily, within three minutes.
OATA’s care sheet says once a day, only what they eat in a few minutes. Those four clocks do not match, so if leftover food remains, drop back to OATA’s once-a-day line.
A simple way to stay inside the published windows:
- Use a food made for goldfish, not a random tropical mix.
- Offer a small pinch, then stop when food is gone.
- Stay inside a one- to three-minute eating window.
- Remove uneaten food after that window.
- Skip a second feeding if waste or leftovers are up.
OATA says goldfish need more carbohydrates than many other pet fish, so use a goldfish formula.
Four current foods, compared by label
These four foods are currently sold, and every number below comes from the maker page.
We did not rank them; we lined up form, protein, fat, and the printed feeding window.
| Product | Form | Crude protein (min) | Crude fat (min) | Maker feeding window |
|---|---|---|---|---|
| Hikari Lionhead Mini Sinking Pellets | Sinking pellet | 46.0% | 6.0% | About 1 minute, 2 or 4 times daily |
| Hikari Oranda Gold | Floating pellet | 45.0% | 6.0% | A few minutes, 2 or 4 times daily |
| Tetra Select GoldFish Flakes | Floating flake | 42.0% | 11.0% | 3 minutes, 2 to 3 times daily |
| Omega One Goldfish Pellets Large Sinking | Sinking pellet | 35% | 10% | Not listed on the maker page |
Hikari Lionhead also lists maximum crude fiber at 5.0% and maximum moisture at 10.0%. Hikari Oranda Gold lists the same fiber and moisture caps.
Tetra Select GoldFish Flakes lists maximum crude fiber at 2.0% and maximum moisture at 6.5%. Omega One’s large sinking pellets list maximum crude fiber at 3% and maximum moisture at 8.5%.
Hikari Lionhead names oranda, lionhead, Azuma Nishiki, and ranchu on the U.S. page. Hikari Oranda Gold says it was developed for oranda and those same fancy forms.
Tetra and Omega One name goldfish, not the oranda form. That is why they still meet the protein-label rule, and why they do not get an oranda call-out.
Package sizes on those maker pages:
- Hikari Lionhead: 3.5 oz (100 g) and 12.3 oz (350 g)
- Hikari Oranda Gold: 3.5 oz (100 g) and 10.5 oz (300 g)
- Tetra Select GoldFish Flakes: 1 oz, 2.2 oz, and 7.06 oz
- Omega One Goldfish Pellets Large Sinking: 3.8 oz and 7.5 oz
Omega One’s maker page lists salmon and whole herring first. That is an ingredient order, not a protein-quality score.
Tankmates, color, and lifespan
Keep orandas with other fancy goldfish, and treat color fade as a water check first.
OATA warns against housing comet goldfish with fancy goldfish. Comets swim faster and often take the food.
The same sheet reports fin-nipping of slower fancy fish, so match swim speed if you add tankmates.
OATA reports many goldfish living 6 to 8 years, and some living 20 years or more. Our page on how long goldfish live compares those clocks with other publishers.
Color change is not a lifespan clock. A slow fade can mark age or water stress.
If color change is fast, test ammonia and nitrite the same day. Our page on why goldfish turn white separates aging fade from sudden loss.
Do not release an oranda outdoors. OATA states that release is illegal in its guidance and can harm wild water.
FAQ
How big of a tank does one adult oranda need?
OATA says at least 100 litres for one adult goldfish, about 26 U.S. gallons. Add 50 litres, about 13 U.S. gallons, for each extra adult. A filter is required on that sheet, and a bowl does not meet the floor.
What water numbers should I keep?
OATA lists ammonia at 0 mg per litre and nitrite at 0 mg per litre. Nitrate should stay no more than 20 mg per litre above tap water. pH sits at 6.0 to 8.0, hardness sits at 5 to 19°dH, and you should test at least once a week.
How often should I change the water?
OATA strongly recommends a 25% partial change at least once every week. Treat the new water to remove chlorine and chloramine. Rinse filter media in removed tank water, not tap water.
How much should I feed an oranda?
OATA says once a day, only what they eat in a few minutes. Hikari Sales USA’s Lionhead page says two or four times daily, in about one minute. Tetra’s Select GoldFish Flakes page says two to three times daily, in three minutes.
If leftover food remains, use the OATA once-a-day line.
Do orandas need sinking food?
Hikari Sales USA’s Lionhead page is a sinking pellet named for orandas. Hikari Sales USA’s Oranda Gold page is a floating pellet also named for orandas.
This desk did not measure which form grows a larger wen. Watch leftover food and air gulping, then pick the form the fish finishes.
How long do orandas live?
OATA reports many goldfish living 6 to 8 years, and some living 20 years or more. That sheet does not split the clock by fancy form. Our lifespan page compares those published clocks.
Can I keep an oranda with a comet?
OATA advises against housing comet goldfish with fancy goldfish. Comets swim faster and often take the food. The same sheet reports fin-nipping of slower fancy fish.
Keep orandas with other fancy goldfish of similar speed.
