Ok, could I replace the Bala with a Pleco or maybe a small school of tiger barbs and still keep leaf fish with GouramisYou say "Bala shark" as in singular, so i'm assuming just one Bala shark. Balas prefer to be kept in groups, some say 5 or 6 minimum. But therein lies the next problem. Multiple balas in that size tank, long term, is a no no. They have the potential to hit 13".