Hello! I’ve had 3 roseline sharks for a few months now in my 29 gallon tank. Out of no where, one of them started bullying the other. His fin is being nipped and this morning he wouldn’t eat. I have him in a 3-way isolation tank for short term recovery but I’m worried if I put him back he’ll just get bullied again. I posted on a Facebook group about this and was verbally attacked for having roselines in such a small tank (29 gallon). The local fish shop owner did not see this being an issue when he sold them to me (he’s an honest guy and has stopped me from buying unsuitable fish before) so I’m confused why some people said I should rid them. Is this why one is bullying the other?