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I have a releatively small jack dempsey in 29 gallon planted tank with a 3 inch common pleco, they have both been together for about 2 years now and the jack hasn't grown much in the past few months. I don't know if the dempsey is a male or female, I would assume female because of size but I remember hearing that there was somethign to do with the speckles on the gill plates (I'll post pics later). My question is: is there any fish that I could possibly add to the tank or is it just too small for the dempsey to play nicely with any friends?