I agree with Vinnie, but baring that from a possiblity, sounds like it could be copper, which is deadly to inverts, especially all you have listed. Check it out with a Copper test and see. GET MOVING!!! All else fails do a water change too. Check the supply water for Copper, then check anything that is in or touches the tank. Inverts a re barometer for the overall health of the tank too. Post some more details and we will all try to help you I am sure. Thanks and good luck!!
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