Hi all, I need some advice regarding my juvenile tiger Oscar. He's about 3 inches, I've had him almost 2 months now. He's been doing well since I've had him though he never took to pellets like I would have preferred. Instead, he has eaten some pellets along with frozen shrimp, krill, and bloodworms. About 2 days ago, he started acting strange. Normally he is the bully of the tank (even though he's he smallest) but he has been sitting at the bottom of the tank in the corner. Occasionally he will swim around and he has come up and ate a few pellets last night and tonight. He looks completely normal, except he seems to be clamped up? No torn fins, no scales missing, no white spots. What do you guys think could be going on? Water params are ammonia-0 nitrite-0 nitrate-10 and temp is around 80. Tank mates are an albino Oscar, roughly 4 inches, a Jack Dempsey around 3 inches, and a roughly 8 inch Lima shovelnose. Like I said, the tiger Oscar used to be the bully of the tank. He was the one who would chase the others around. Now since he's laid out I haven't seen any aggression whatsoever. Tank is a semi-planted 120 with a sand bottom. I do weekly (sometimes twice a week) water changes. My last one was this past Friday. The only thing different is I added Purigen to my canister last water change. Everyone else is fine and happy and eating well. I don't know what to do since there is no outward sign of illness. I would appreciate any advice/help! Thanks!!
