Dwarf pufferfish (Pea puffer)

1) Where they come from

Pea puffers come from slow, plant-choked waters in southern India (Kerala region). Think shallow streams, backwaters, and little pockets of water with tons of cover and micro-life. That “busy, messy” habitat vibe explains a lot about why they act the way they do in our tanks.

2) Setting up their tank

If you treat pea puffers like tiny community fish, they’ll humble you fast. They do best in a tank that’s basically a jungle—plants, hardscape, and broken sightlines everywhere—so they can get away from each other and feel secure.

• Tank size: I’d start with 10 gallons for a small group, bigger is easier. A 20 long makes life way smoother.
• Planting: Dense stems (rotala, ludwigia), moss, floaters, and crypts work great. Add leaf litter if you like that natural look.
• Hardscape: Branchy wood and piles of small rocks help create “rooms” so one puffer can’t glare at another 24/7.
• Filtration: Gentle flow. Sponge filters are awesome because they’re safe and they grow snacks (microfauna).
• Parameters: Stable matters more than chasing a magic number. Neutral-ish water is usually fine as long as ammonia/nitrite are zero and nitrates stay reasonable.
• Lighting: Moderate. Enough for plants, not so bright that the fish feel exposed.

3) What to feed them

They’re little hunters, and most won’t recognize flakes or pellets as food (some do, many don’t). Live and frozen foods make a huge difference in their color, confidence, and overall health.

• Staples I’ve had the best luck with: frozen bloodworms, blackworms (if you can get them), live or frozen brine shrimp, daphnia.
• Snacks that keep them busy: small pest snails (ramshorn, bladder snails), tiny scuds/seed shrimp if your tank culture has them.
• Foods that can work but vary fish-to-fish: chopped earthworms, mosquito larvae (if safe/clean source).

Feed smaller amounts more often rather than dumping in a big meal. Puffers love to stalk, miss, try again, and spit things out. I also like using feeding tweezers—once they learn the routine, you can make sure the shy ones actually eat.

4) Behavior and tankmates

They’re adorable… and they can be absolute little gremlins. Expect curiosity, stalking, and the occasional face-off. A lot of “aggression” is really just them arguing over territory and food.

• Best setup (in my experience): species-only group in a heavily planted tank.
• Group size: odd numbers can spread the drama out a bit (3, 5, 7), but space and cover matter more than math.
• Tankmates: risky. Slow fish, long fins, and shrimp are usually a bad time. Snails are food, not décor.

If you do try tankmates, pick quick, non-flashy fish that don’t hang in the puffer’s face, and have a backup plan. I’ve seen it work… and I’ve seen it turn into fin-nip city overnight.

5) Breeding tips

Breeding pea puffers is totally doable if you give them a calm tank and lots of fine-leaved plants or moss. They aren’t big on fancy nests—they just want cover and good food.

• Conditioning: feed heavy on live/frozen for a couple weeks (blackworms and bloodworms are great).
• Spawning site: thick java moss, subwassertang, or a dense clump of plants where eggs can disappear.
• What you’ll see: a male patrols an area and courts a female into the plants; eggs get scattered and ignored afterward.
• Raising fry: the hard part is first foods—infusoria, vinegar eels, microworms, then baby brine shrimp as they size up.

6) Common problems to watch for

Most pea puffer issues I’ve seen come down to three things: stress from bickering, not eating enough (or not eating the right stuff), and parasites from weak sourcing.

• Bullying and fin damage: happens in sparse tanks. Fix with more cover, more space, and sometimes rehoming the worst offender.
• Skinny “pinched belly”: often food competition or internal parasites. Try targeted feeding; if weight won’t come on, consider a quarantine and deworming plan.
• Refusing food: common right after purchase. Offer live foods first (blackworms/brine), keep lights lower, and don’t keep hovering over the glass.
• Bloat: don’t confuse a full belly with dangerous swelling. True bloat looks tight, persistent, and the fish acts off. Treat as an emergency and isolate.
• Old tank syndrome / dirty substrate: they hunt along the bottom and through plants—if the tank’s neglected, they’ll be the first to show it.

My best general advice: keep the tank stable, feed like you’re running a tiny predator exhibit, and don’t be afraid to rearrange the scape if one fish starts acting like it owns the whole zip code. With the right setup, they’re one of the most entertaining freshwater fish you can keep.