I have an adult male 8 year old Rainbow Cichlid that i have owned since he was very small. I originally had two females with him and he produced one baby with one of them. Over the last three years despite my best efforts both females and the young fish have passed away. The male has been on his own for just over a year as a couple of my local fish shops have said that he would be too territorial to put with any other fish. Can anyone give me any advice as to whether i could reintroduce him to any other type of cichlids or if he would be better off continuing living on his own. Any advice would be gratefully received.