That is what I would thing got to it. Something got in from that. All it takes is one the size of a dime or less and it could destroy everything. The pond has enough volume to disperse the concentration to the others but if the ray ingested it some how it would get taken out. Rays are also hyper sensitive to things like that, they even vary in specimens as to tolerance for different things. That one could have been more sensitive to whatever got in then the others and it killed it. The other two may have been a bit stressed but acted fine. The only way they have to clear their systems is to 'sweat it out' thus the slime coat. Much like big cats, but big cats revert to vomiting before anything else in most cases. My limas will shed slime coat if something is not right. They shed copious amounts also. Found this out with my bad prime experiences. Now I test all new dechlors on their tank first. That way I can see right away if something is not right before it gets into my aros or rays. The cats can handle it better and tell you right a way. I always leave enough of the last bottle to do a few changes on the trial tank if need be.
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.... and no nobody has died ... lol. But the pool did spring a bad leak over-night... we had a very tiny leak this last week that started and we haven't ben able to find it.. well this am when Justin went down stairs there is a few gallons on the floor... i'm guessing its leaking almost 1/2 a gallon an hour atm... we're draining the pool as low as we can to check for leaks along the base to patch. Anyone have any suggestions for safe way to find the leak other then go over it w/ a fine toothed comb once its low enough to pull up the edges? ( I'm hoping with 1' or less of water we'll be able to lift and spot the leak better then compleatly draining.)
so I get some satisfaction from having to do this.