moved the big guy to a larger aquarium , it was a big ordeal , mostly for him (or her , dont know ) anyway he doesnt want to eat. im guessing its because he is just freaked out . he had to spend some time in a 5gal bucket while i moved his smaller water box then back in aquarium for a couple of days then scoopped out and put in the larger . he looks just as good as ever and moving things as before , just wont eat . if this helps, he is about 3 yrs old (big fish)

I assume that the tank was cycled properly before you put him in? How is his breathing? It could well be that he is just a little stressed and that's why he's not eating. Hopefully he'll get over it and go back to his normal self

I recently had to do a full water change as I moved things around, which meant taking Oshie out, he's only 7inch but still managed to soak me!! For the next three and a half days he sulked in a corner, I finally coaxed him to eat a fly on his stick, ho loves flies!! Yours should be right.

He has probably just got the hump. Oscars can get a bit moody especially when things are changed. Hunger will soon get the better of him and he will want to eat

thanx for the input , water qual ,0 ammo ,0 nitrites ,5-10 mg/L nitrates ,ph little high 7.4 & falling (little atta time),GH <20 mg/L , KH 50 mg/L , yes cycled . coaxed him to eat some feeder fish in the last few days . he's gone back to trying to move EVERYTHING in the tank (he can move some very heavy things). But anyway , thanx again , I'm pretty sure he'll be OK , like I said , he had a rough time and just seems to be mad at me . not as much at my wife .