Here is my aba aba set up before with tankmates, just to give you an idea of how yours would work when they grow. just follow the link.
http://www.monsterfishkeepers.com/f...81375&highlight=3000+gal+wall+tank#post381375
http://www.monsterfishkeepers.com/f...81375&highlight=3000+gal+wall+tank#post381375
my S. arowana is already eating pellets without any starvation process and he still eats them even if I give him some superworms or sardinellas tawilis(whitebaits)
from 8"-9" after 1 week
though I still envy you because you can have as many fish as you want because you have a pond and larger aquariums while I can only accomodate a 200 gal tank outside the house because my grandmother doesn't allowed me to put in a 300+ gallon tank inside