they are not 100% herbivorous. they like the meaty foods i feed the tank as much as the algae foods. they can be territorial within thier same species. between species they tend to be ok. i have a midas and a bicolour right now in the same tank. i plan on adding 3-4 more different species. i would like to get them all at once so that they can all fight it out themselves.
they can be kinda nippy to other fish that get in thier territory, but nothing more than a hey-you-nip. they are not good enough swimmers to chase anybody for very long.
G~