Need help with DWC mothers. Please!!!

I have a mother in a 5 gallon bucket. I was feeding around 1.5 EC and my older stems are turning purple, then my biggest fan leaves are what looks like burning. Spots that are copper/rust looking. New growth looks twisted, but green.

I lowered my EC down to 1.0 ish today with fresh h20/nutes. . . She is under a t5 light 24 hours a day.

Any ideas?

nute burn, if the adjusted nute solution doesnt start t fix things, flush your resevoir, i know for a fact that the curling of the new growth while it still being green is a nitrogen overdose

I thought that was the problem. Already looking better today. Thank you.