Yes, the few days before that I didn’t feed her and that day I didn’t feed her. Stocking is: 1 molly fish(male), 2 female platies Right now she is darting around the tank, she sometimes is not moving in the middle of the tank but fins aren’t clamped. She sometimes goes up and down against the glass or sideways against the glass. She is lethargic also and sometimes suddenly darts!!Is this normal?!It could mean your platy is/was overfed, underfed, or pregnant, but it’s not uncommon for livebearers. If your platy has any other symptoms, I would definitely reevaluate the situation.
What is the full stocking and how much are you feeding?