I really want maybe a 50 or so, but it seems my parents really only are willing to invest in a 30-40 with me. I want big, (aggressive) cichlids that have lots of colors. I already have a growing GT in my tiny tank. Anyway, besides the green terror that will go into the new big tank, what else can fit- or how many fish approximately will fit together. I was thinking maybe about 4-6 (jacks, GTs, oscar) plus a pleco. Is this too much, too little, just right?