Well I wouldnt quit after just the one attempt. These fish are prone to swim bladder disease,I had one for years and treated it successfully on occasions but it did come back after time again. Blackmoors are fab to look at, there eyes and tail are great. Perhaps you should look at maybe trying Lionheads,they are v good to look at and tend to be that bit harder. Was your fish in coldwater or tropical. Coldwater I presume?