it's just amazing the difference in agression between the "big bad" oscar and my smaller Jewel cichlid. so for the last few months I've had a problem with my 8" Synodontis Eupterus beating up my other catfish and even my 10" oscar(yeah thats right) in my 90g. so today i figured, instead of getting rid of him, why not try him in my 55g with my smaller SA and CA cichlids. i had 2nd thoughts because of the size of my Synodontis, but i tried it anyway. then the second i put him in, BOOM, my Jewel Cichlid is face to face with the fish 2x bigger then him in shear size and wouldnt back down. The catfish is doing fine now, but i guess theres a reason why The Jewel is the top dog in that tank. 
