That happened to a couple of my retics when I got the 10 before. It is the reason I won't do retics any more. I was tempted on yours if you'd have parted with them but I see that it still is a risk with them even after a long time. Never did find out, that being said I had pesticide get in my tank and only kill one of my gars. It killed all my aros and big cats. Gars are very tuff fish in terms of things they can take.
Is there anything that could have fallen into the pond. Ex. Paint chips, plastic, insulation, silicone, something to that effect. If the ray ate it, witch if it is anything like my leo male it will, it could kill it in that way. My male Leo tries to eat the power head. If one little speck of food is on it he rips the power head of the wall and tries to eat or smash the power head to get that speck of food. You'd think it was starving and not a daily hand fed until stupid fat ray. Honestly I don't think I have seen him not trying to eat something since he settled in. In fact today after powerhead smash up derby i caught him trying to eat my big suction cup holding my spraybar in place. As well as my magnetic glass cleaner...he may just be defective though...Lol
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