On friday I was at my lfs and i saw a 10gal tank for cheap. So i bought it and went to get some dwarf puffers.

I set the tank up, acclimatised the puffs and let them lose. I put a few ramshorn snails in, and two ghost shrimp.

They were fine for about 48 hours, then one was on the bottom, not looking too well. This puff has been on the bottom of the tank for three days now, she seems to be gasping, too. I've done daily water changes incase something was in the water, but no change. The other puff is fine.

Size: 10gal, heavily planted.
pH: 7.6
Ammonia: 0
Nitrite: 0
Nitrate: 0

Any idea what is wrong?

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Could it be the other puffer bullying it? The Dwarfs are very feisty little things, and can be bullies... If you think it may be the other puff, adding a couple more may help spread out any agression.

This might sound silly, but how did you mature the tank since friday?

I havn't seen the other puffer bullying it, and there's plenty of plants to break up their line of sight... so i dont know

and yeah, i used mature filter media. Sorry, forgot to mention that lol.

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another silly question, is there a heater?

Ive always had bad luck with puffers, but i know they can be very sensitive to water quality, maybe puffers are like stingrays, and need a really mature tank. I think there are specific puffer forums out there which might be worth looking at. maybe theres a lack of oxygen or they may need brackish water

if its the travancorius dwarf puffers then theyre full fresh water puffers, many puffers can suffer from lack of oxygen especially following big meals, make sure your filter return is breaking the waters surface.
its always important to know exactly whaich puffer species you have

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Could be... How are his fins looking? Nips or fluff?

Fins are looking fine, they are clamping htem and unclamping them like they should.

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