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Ok, I changed 50% of my water and all of a sudden after that, my shrimps are hanging out on the suction cups of my heater and filter near the top of the tank. and if they swim, they jolt around and have a twitching motion then go back the to the suction cup, some are inactive, I don't know whats wrong, I added stress coat and flourish after the change, did the water change affect them? I have been doing 50% for 2 months with them in it. amano and cherry shrimp.