YES! It would be too much, I would only add the bottom species, and lastly the betta, unless you have too. But then, you need to be doing 2X weekly 40% atleast WCs, IMO. It seems like you have bettas in all your tanks, maybe skip them for now, the same fish gets boring, try planning for different species, like cichlids, labyrinths, dwarf cichlids, catfish, etc. I would never do the same fish in different tanks, unless I am breeding them.