Tiger ray

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Tiger rays tails will die off if water quality is bad, similar to the larger catfish with long whiskers or streamer. Bad thing is tail will not grow back. It is either water quality, bacteria, or another ray bit it. If you have an aggressive ray in there the stress can kill them and they can get tails bit. Only bad part is it is up to you to figure out which one is happening. The more info you can give us the better.
 
Second tiger ray which had red(bloody) tail days ago, died this morning. also found lice him. Last living tiger ray is clean of the lice(at least that I can see). 180g Tank temp is 84 degrees. water test were, amonia=0, nitrite=.25, nitrate=15, pH=7.5. Dead ray ate 3 nightcrawlers and living ray ate 4 nightcrawlers yesterday. other tankmates were two 6" three line cats. The rays normally swim over each other without incident even one stopping directly on top of another. Filtration consist of two fuval 404s and two emperor 400 hangons. low light from basement window. I did big water change approximately 75% while trying to keep temp same as possible but it did drop to 80 degrees over 1.5 hrs of changing water. I did first dose of CyroPro to rid the lice.
 
How big are these rays

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Probably stress of lice and 75% water changes. Even if you keep the temp the same, there are many other water parameters to consider. Most likely the water chemistry from the tap compared to the tank is significantly different adding stress to the rays. Try smaller more frequent water changes rather than 1 large water change.
 
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 ???
 
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