In my 10 gallon tank I have one Syndontis and two Ottos. I was thinking about putting a guppy in the tank as well but I dont know if the Syndontis will try to nip at the tail of the guppy. Any advice would be great.
Mine have been fine with little fish like tetras and platies, I doubt they'd go after a guppy. They aren't aggressive towards other fish (aside from each other occasionally).