Cal dream bottom leafs dieing

Hand me down plant. Germinated feb3 I got it two months later. Was in poor shape. Nursed it back maybe to little to late? Put in 4 gallon plastic pot with ff original soil. Using ff trio nutes. Ph last feed was 6.4 in 5.9 out. No tds meter yet (on the way). 650w blurple light with 180v true.did light lollipop and 3x topped.setting up to scrog and flip soon. Not sure of lockout or? Tia