Right now my 3 arowanas are in the same tank. (So they're use to Yea other before I add them to the pond) and I also have a tiger shovelnose the arowanas are 1ft+ in length and the smallest is around 8-10in the tiger is around 6-8 in he can eat 2 in bala sharks. My question is if I pick up some discus at about 2-3 inch will the discus be fine? They're shapes shouldn't make them targeted by the catfish right?