Swimbladder Issue

[earhtmother]

We have an adult female molly with swim bladder issues. She can be fine one time you look & doing headstand's the next

 

[coralbandit]

What is your waters ph/gh ?
Most livebearers need moderately hard water 7.5+ Mollies like guppies can live fine in full marine tanks.
Ph isn't always accurate reading of hardness and gh can be hard to read if low...
I use wonder shells in my livebearer [ swordtails / Red picta ] tanks to help add minerals I know they like..

 

[earhtmother]

Yeah it's just seems a bit odd as all the other mollies, platies & kribs are the samw as always