Hello! I am new to the forum but I have a question. I have a 29 gallon with a 4" Jack Dempsy(came with the tank I bought it used) and I have added an angelfish and a few feeder guppies. The JD isn't hurting any of the other fish so I wondered if it would be ok to assume they can live and be happy together, or if I might run into problems in the future. The reason I put the angel in with the JD is because it was free. I was going to just let JD have the tank to himself because that was what he was used to. Any advice would be great! Also how do I tell if the JD is a male or female?