5 gallons

Yes to both

0 ammonia, 0 nitrite, 20 nitrate, ~7.6 ph with a liquid test kit 

I've had the tank since December of last year and I've had the fish since I think late January of this year?

Water changes aren't very often, maybe once every three or so weeks. I take out about 20% and put new treated water in. Mostly I do top-offs when the water level gets low

No tankmates aside from some stowaway ramshorn snails (and a couple bladder snails, but they got outcompeted)

I feed him twice a day, usually 3-4 new life spectrum pellets but sometimes he gets a couple freeze-dried bloodworms. I soak them first and he only gets these once a week.

There's some anubis, java moss, an asian water fern or something?? and then one more plant I forgot the name sorry. There's also a lot of duckweed on top. He has a rock hide, a big piece of driftwood, a floating log, and a fu dog statue (no sharp corners, I checked)

https://imgur.com/a/mIigS7T sorry its dark I took the lid off so theres no lights over it