Nope, as long as you realize what they eat and don't have that in the tank you're golden. I've never had an issue with them either, now Huma Huma, Clown and Undulatus can be hit or miss, but black triggers seem to be good natured. I have an Undulatus in the shop that's been great, he's like a puppy but others from other areas are little shits.so it could be hit and miss with them then ?