I had three to start with. 8", 11", 12". About a month ago, the small one had a red or bloody colored tail, and died 2 days later. the second one developed the same red or bloody colored tail and died 3 days later. I also found lice on this one, which is the reason for the large water change, per CyroPro directions.
Also, I don't use tap water, I use filtered well water. I'll have to start providing a large supply of standby water for my water changes. I've been keeping and breeding African Cichlids, mostly wc, for about 10 yrs. and I thought rays would be similar to keep. Man was I wrong. I'm not giving up but I must read and study for them. Its terrible to remove these wonderful creatures from their natural environment into our homes to enjoy and not provide that same environment they are in need of. All that being said, are there any suggestions for reference material ???