I have 3 Ottos in a 36 gal bow front. When I put them in there the biofilm was everywhere and they made short work of it!
So, I brazed some zucchini and cucumber for them.
I wanted the Hillstream Loaches but they are hard to get. Now I would feel bad about kicking out the Ottos! They’re a great worker and fun to watch. They even swim in school with the Rummynoses!