First grow ever please help!

Idk what I’m doin wrong or what the problem is. Water temps were a lil high but I’ve been able to keep the water at 71-72f, Ph is at 5.8 and about 500 ppms. Using Hlg 650 at 24” above canopy with the dial relatively low. I’ve looked through a microscope and haven’t noticed any pests. What can this be?
 

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