i'm not gonna burn you to bad but you do have a hillbilly tank, honestly you need a 75gal tank for just 1 oscar to live comfortably. Just take all your fish back to a store and let them get the fish off your hands. I usually suggest turning up the heat and cooking them but thats inhumane. Look online at african cichlids, you might want to stick with the lake tanganykians because they stay smaller than the malawi's and victorians. You can do alot with a african cichlid tank, read up on them, i'm sure you'll get cichlid fever and fall in love with them. Tanganykia has sand sifters, shell dwellers, rock dwellers, syn cats, goby's, eels puffers, and so on. PM me if your at all interested and i can get you some links to great sites. Also get rid of that piece of junk fluval and go out and buy yourself a eheim or atleast buy another fluval and add it to the tank. Always overkill your filtration.