Oh boy! This is getting increasingly difficult!
yeah i know how you feel. keep in mind that im giving you "safe" advice. some people mix fish willy nilly and worry about the consequences later, so youre free to try what you like. but since youre still in the upgrade phase i would go ahead and make everything perfect from the get go, especially if you want to get the most out of a beautiful and pricy fish like an asian aro.
if you were to locate some large clown loaches they would be perfect for your tank.