Give one puffer enough tank to hold its territory
One pea puffer does well in a 10-gallon tank. Pea puffers are territorial, so a larger footprint with more plants and cover lets them spread out. For a group, plan about 5 gallons per fish. A group of three works well, with one male and two females.
Measure the tank's actual water volume before you buy equipment. Water volume is lower than the tank's advertised size once substrate and decor are added.
Use the aquarium tank volume calculator to check your water volume →
Arrange plants, cover, and gentle flow
Pea puffers are shy and prefer cover. Plant the tank densely and add rock or wood where the fish can retreat out of view. Keep the water flow gentle, because strong current tires a small fish and pushes it away from food.
Size the filter for the tank's volume. The filter turnover calculator shows how many times per hour your filter moves the full tank volume.
Hold temperature, pH, and hardness in a steady range
Set the heater and check the thermometer daily. A stable temperature matters more than hitting one exact number.
| Parameter | Target |
|---|---|
| Temperature | 74–82°F (23–28°C) |
| pH | 7.0–8.0 |
| Hardness | Soft to moderately hard |
| Ammonia | 0 ppm |
| Nitrite | 0 ppm |
| Nitrate | Below 20 ppm |
*Note: Test ammonia and nitrite with a liquid test kit before adding a puffer, and retest whenever the fish stops eating.*
Cycle the tank before the fish arrive
A new tank needs a working bacteria colony before it can process fish waste. Cycle the tank with ammonia dosing, then add the puffer once ammonia and nitrite both read 0 ppm.
Feed snails, frozen food, and live food in small portions
Pea puffers eat meaty foods. Snails are a staple food. Frozen foods such as bloodworms and brine shrimp give a varied diet. Live blackworms and snails work as occasional treats.
Feed small portions twice a day, and remove uneaten food within a few minutes. Overfeeding fouls the water faster than most owners expect.
Feeding Guide
- Snails: Staple food, sized so the puffer can crack the shell.
- Frozen bloodworms and brine shrimp: Regular meals.
- Live blackworms and snails: Occasional food.
What to check when a pea puffer stops eating
Start with the water. Retest ammonia, nitrite, nitrate, and pH, because poor water is the most common reason a puffer refuses food. Then change the food type: a fish that ignores one food may take a live or frozen option readily.
Check the tank for signs of bullying, such as a fish that hides constantly or shows torn fins. A puffer that stays off food for several days needs a closer look at its health, including the fins, skin, and body shape.
Common questions about pea puffer care
Can you keep more than one pea puffer?
Yes. Plan about 5 gallons per fish. A group of three, with one male and two females, is the group size this guide recommends.
Do pea puffers need snails?
Snails are the staple food for pea puffers, and they keep the fish's beak worn down. Pair snails with frozen bloodworms or brine shrimp for variety.
Why are pea puffers also called pygmy or dwarf puffers?
All three names refer to the same small pufferfish, Carinotetraodon travancoricus, which stays about 1.5 inches long as an adult.
Why does a small puffer still need careful planning?
A small fish is still territorial and sensitive to water quality. Its long-finned and slow-moving tank mates can be nipped, and it does not do well with larger fish that could eat it. This guide covers one puffer or a small group of puffers; tank mates need a separate check.