I started a 10-gallon aquarium one or two months ago At this point, I have 2 red-eyed tetras, 2 zebra danios, 2 guppies, an algae eater, and 2 black mollies.
I've been having poor luck with the black mollies. I'm not sure what the sickness is, but I've already lost 2 of them to it, and one of...