My female swordtail is sort of lying down in the bottom of the tank. Shes just sitting there. I also have a male.

None of the other fish are doing this, just her, im wondering what it could be because she looks totally healthy.... I'm ondering if she could be pregnant, but i doubt, she doesn't look fat at all.

I need to know if she's just feeling off, or if this is a real problem... Thanx