I might be interested in some of the gymnos. They should be fine with the minuano, right? the carpintis is being sold so there shouldn't be any aggression problems.
The Rhabdotus (rhabdotus and meridionalis) group stay samll @3-3.5" , others can get 5". Look at my price list for what's available. Gymnos do fine with pikes. Ken
Nowhere near large enough to outgrow the tank the pikes are in then. You can sex them all at the size they are at, right? have you managed to breed any of them?