5.5 gallon tank. its been running for almost two months. the tank has a filter and stays at a constant 80 degrees. My molly passed this morning but i would like to prevent my other fish from dying as well (I have 4 left). My molly was breathing very hard and would sink to the bottom of the tank...
I have a marble molly who i cant tell the sex. they wee fine earlier today and then i came home and they were laying at the bottom of the tank. I isolated them in a cup and theyre trying to eat but sink everytime they try to swim. What can I do? Im really concerned and dont want to lose them.