I was really worried today when I brought it home cause he/she just sat there and wouldnt swim around...I thought at first I picked out a sick one but now its ALL OVER the place lol! The water is between 75 and 80 degrees, Im to lazy to go see exactly what it is haha. I like to do water changes every other week, is that enough? I put stuff in every week to balance nitrates and ph also. I have pellets but Im not sure what the pet store was feeding them. I also feed my Clown Knife fish frozen brine shrimp, Im sure the oscar will get in on that ^-^ I tried feeding the pellets but no luck, maybe shes just to nervouse or not hungry. Right now shes in a 20 gallon long with the CK who is also a juvenile, very small yet, but I have a 120 gallon coming in a few weeks, super excited lol