Hi, I got a new clown today and she is the same size as the clown already in my tank. The one in my tank used to be a male, but has been alone for about 4 months now.
Will there be a problem with them living together as they are roughly the same size?
So I put her in there and they immediately started going at it and wouldn't let up so I took her out after 5 minutes and returned her. Guess they were both females!
Do you think I would have more luck introducing a significantly smaller one?
It depends on the species. Some maroon, tomato, cinnamon, etc. will never accept a mate. They do best with a breeder box intro. Most occelaris and percula have no problems.