cleaner fish

What's a good tankmate for an asian and a silver arowana (seperate tanks). I don't mid snails, crustaceans, fish or anything just that it can eat various type of algae, doesn't bother the arowana and wont be bothered by the arowana and dosen't have a huge bioload.

I have 1 venestus, 1 kyoga flameback, and about 6-7peacocks, 2 acei blue, 1 colbolt blue. What can I put in the tank to help control the algae and left over food the others don’t eat? Also what kind of other peacocks or haps can I put in my tank. I only have lemon jakes and red empress. tank...