I have a 265 tank with 4 tiger moray eels, fire eel, mini marbled stingray, hystrix stingray (both fully grown at about 9-10 inches), 3 archerfish, and 2 snakehead gudgeons. Everyone is getting along great, I’m wanting to possibly at a small 2-3 inch Oscar. I have heard of you add them small enough in a big enough tank they will grow up with the other guys and not be aggressive with the others. Should I try adding one? Or you think there’d be future issues? Thanks!