What's your air intake like ?? If air flow is good and it's not a heat stress issue id get some Epsom salt mix week mix in spray bottle and spray plants just before lights on then water with a higher nutrient level then your currently using... Epsom salt will open up the pores in your leaves lol that's the way I describe it 😂. And they will uptake light and nutes alot better spray once and wait for a couple of days to see results 😉
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