One problem though ... it's a male. 
Seriously though, this molly's stomach looks way bloated. He's easily 0.5 times larger than the other mollies. And all he does nowadays is hang out at the back of the aquarium by himself and just swims in the same spot looking bored. Either that he's sleeping at the bottom of the tank, while everybody else is swimming around. He still eats when I throw food in the tank though. It's about the only time he comes back to life.
I think he's sick. Am I about to lose another fish?

Seriously though, this molly's stomach looks way bloated. He's easily 0.5 times larger than the other mollies. And all he does nowadays is hang out at the back of the aquarium by himself and just swims in the same spot looking bored. Either that he's sleeping at the bottom of the tank, while everybody else is swimming around. He still eats when I throw food in the tank though. It's about the only time he comes back to life.
I think he's sick. Am I about to lose another fish?