I checked the ammonia after they died, it was at 0.25 but I wasn't sure if the copper was giving it a false reading. I'm using cupramine, there is nothing else in the tank. I will get a water change ready today, will pick up an airstone as well. I have to find a seachem copper test as well, we have the API test. Others look ok this morning, going to feed them and see how they respond.
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