I was given an overstocked 5 gallon planted tank and have recently cycled a 20 gallon planted tank. I have placed a piece of driftwood with an anubias growing on it in the new tank along with several other plants and a Marimo algae ball. Most of the other fish have been rehoused in the new tank, but I am afraid to move the oto. He never eats the algae wafers (tried 3 varieties), blanched spinach, cucumbers or zuchinni. He/she is thin with only a slightly rounded belly. I want to get 2-3 more otos, but not until I know they can thrive. How long should the new tank be up and running before he would find enough to eat? Any thoughts or suggestions would be greatly appreciated.