I have about 5 black skirt tetras, this one is getting really fat though. I have a school of 5 of them, and all of the rest seem to be normal size and healthy. They are in a 70g with a marineland 350 magnum canister, the tank has 2 gourami, 5 tetras, a pleco, and some neons. I don't know if this one has eggs, or maybe is sick?
Not sure about sexing them to determine if it is even a female. If its sick how do I go about treating him... any help would be greatly appreciated!

Not sure about sexing them to determine if it is even a female. If its sick how do I go about treating him... any help would be greatly appreciated!
