arowana tankmates

Dear Monster fish keepers, Currently i have a 4x2x2 tank, almost 75 gallon. I have 6 tin foil barbs, 8 silver dollar, 5 parrot fish, 6 Bala sharks, 1 black ghost knife fish, 2 common plecos. I am planning to make an 8 feet lenth, 2 feet wide, 4 feet height tank, almost 400 gallon in my...