really new to dwc set up help me out

Well heres my setup its a sunburst 250 watt with convertible ballast i have them under 16/8 well my question is do they look good it looks like nute burn i flushed it out already the ph is at 5 its goes up and down .2 once in a while...

Looks like very beginning of nute burn. what kind of water are you using?

im juat using purified with nutes at one third of the recomened dosage i jus got my ph tester and my ph was at 7.5 toooo high so i was probably thinkin its a def.

Purified or RO? You might have a Cal-Mag deficiency.

Txclstmn said:

Purified or RO? You might have a Cal-Mag deficiency.

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just puried with nutes man at 1/3 of the required nutes should i add more im usind pure blend

The only other thing might be the PH. If it's dropping below 5 that might be causing an issue. You might also try flushing with just plain ph water with a little superthrive

Try get 5.8 for ph
and I think that it looks like burn to me but a bit hard to tell
what ppm are you

Id either go 18/6 or 24 hours...

preferrably 18/6.