I've had this aquarium set up for a year and it's dying and I don't know what to do!
90 Gallons
5 yoyo loaches
4 red eye tetras
10 guppies
1 clown loach
The fish are all well and I have 0 ammonia, nitrates, a pH of 8.4 and I do regular water changes. I have a large canister filter and I keep...