i have 2 otos in my guppy 10gal. an i LOVE what they did to it
i was wonderign how many it would take to clean a 20 long gal with 10tigerbarbs. PM me to tell me cuz im not on that much an this will prolly be lost by the time im next on
Have a read of the couple of pinned articles around TFF to get an idea of what to feed them!