The sinking molly has been in the quarantine tank with 3ppt of salt for
a couple of days now. The medication I've used so far hasn't improved
her sinking condition. But she's become hyperactive and can't stop
begging for food. She looks on the skinny side, but that could be to do
with her swimming bladder not functioning properly.

I think I'll return her to the main tank in a week or so, whether she
floats or sinks.

Nikki