i'm getting a 300g amazonin tank 87"x28"x28" with a 3d background and i'm going to keep around 10 or so wild discus 50-75 cardinal tetras 30-50 rummy nose tetras some corys a group of otos and then i wanted some peaceful cichlids like Festivum or earth eaters the tank will have a sponge filter in the background a 50g sump and a 50gpd automatic water changer