@GVHBV
Hi there,
it's quite difficult to help when you are not sharing more informations.
How's your light Situation?
What is your growmedium?
Where is your PH Value?
How often do you feed your damsel(s)?
How much do you feed them?
What about your Humidity and Temp?
Normally you get fellow tips when you feed her too much Nutes.
Good luck,
OimRausch