starkiller

My 2 Starkiller plants both have this. Plants-Starkiller (Rare Dankness) Light- 600w MH 1/ Bubbleponics (Top-Feed DWC) 1/ Coco Coir (No Perlite) Nutes- GH Flora Series, Superthrive, B1, Cal-Mag, & Hydroguard. Temp 77-81F PPM- 450 PH- 5.8 (I just topped this plant but the problem came before...