Brown spots

Last feeding was on 6/12 ph in was 6.48 ppm in was 933 ph runoff was 6.17 ppm runoff was 938 growing in a 4×4 tent ffof with blue planet trio at recommended dosage she is a auto white widow crystal meth also 10 ml per gallon calmeg and 1 tbsp black strap molasses she was a seedling on 4/13 light is a bloom plus bp3000 about 20 inches away in closet with plenty of fresh air tent doesn't hot on inside tent is right beside air vent blowing 73 degree air coming out only plant doing this out of 4 in same tent with same water cycle which I go by with when she feels light happy growing everyone thanks in advance she looks happy and doing well but there is something going on