Ok so we have had glo fish for over a month and they have done great. A moth landed in there 5 gallon fish tank and died. We didn't find it for a few days, it was sucked into the filter. Today we found fish have ick, and we have lost 1 fish. We have one larger tetra that appears to be dying. It's laying at the bottom of the tank. We treated tank with aquarium Salt, changed over 50 % of the water and added a treatment for water that has aloe in it. What else should wedo?