Can anyone help with my problem? I have 4x4 grow room using plant magic soil, 600w led came with tent, 4 gg4 from sensi seed, I recently used 2 bio tabs at day ten in my 3 gallon pots, I also have perlite 25% using 250ml tap water every day or 2 but leaf looks little dry on of the girls has a little yellow spot on it is there any advice or anything I should be adding it's my first grow and not sure if my girls are in good health or not?