molly swimming with tail down

[MyCatsDrool]

I have a very nice sailfin sunset molly that is acting unusual. She seems to be swimming with her tail dragging or drooping. Is this indicative of anything wrong?

 

[dskidmore]

Is she swimming higher or lower in the tank than usual? Is she eating well? I would suspect gas or swim bladder problems. Might try feeding her some blanched peas and see if it helps.

 

[MyCatsDrool]

Thank you, I will try the peas.
She is swimming at her normal levels in the aquarium, but her tail section is drooping, for lack of a better word.
She is eating, but not quite as active as her partners. She is not pregnant that I can tell, as she is not swollen or gravid.

 

[Puriti]

How old is she? If she's young it's probably a swim bladder problem but I know I have an ancient male molly that's just finally catching up with his age and he can't swim that well anymore ...he's almost pushing 4 @__@

 

[Zagz]

What are your water parameters? What size tank and what are her tankmates?

 

[MyCatsDrool]

She is in a 29 gallon aquarium with 3 other mollies and a few of their babies (maybe 5 1/4-1/2 inch baby fish). They are constantly breeding. I net out most of the babies and feed them to my other fish. The ammonia reading is zero, nitrite is zero, nitrates are about 30 and pH is 7 on the spot.