so currently i have a south american tank setup of 120 gals. the tank contains a large piece of drift wood and a couple of rocks. The water parameters are perfect (all closest as possible to zero) with a temperature of 80 degrees and a ph of 6.5. The fish currently housed are a motoro stingray, a silver arowana, and two green severums. i know that the aro will get big, real big, and i will have a bigger tank at that time (year or so down the road). i had six angels in the tank but had to move them to a hospital tank for some kind of a body fungus, i think they have had it since the day i got them, they are wild caught. now that their out of the tank i want to get somthing that gets bigger. i first thought black pacus but wouldnt they get too big? any other ideas? oh and it dosent have to be just cichlids. thanks everyone.