African butterfly fish WILL rough and tumble with your arowana if you put it in before you remove the aro. Butterfly fish is far more zealous at attacking your arowana, but because of size differences if your arowana is thicker it will scoop your butterfly fish with one strike. forcing either/or to a lower depth of the tank but ABFs refuse to dive lower unlike arowanas so hope it wins otherwise it will keep rising back up to fight the aro to the death.
I want bichirs too but i can't have them. no help here sorry.