Hi, ok, I'm about 5 weeks in and having some issues. This is my 4th grow but first time I've had anything like this. I thought it was just bad nute burn at first, but I only fed twice so far (because the plants where really yellow, didn't seem to be growing well so figured the soil was not provinding enough food) Got plenty of light, 600w, got good air circulation, temps 70+. I've not taken pics of all of them but every plant has same problems at varying stages, brown spots on leaf, dead patches, new growth stays unaffected for a little while but then goes the same way. At the moment I'm seriously considering scrapping them and starting again so any help would be greatly appreciated. Also ph is between 6.8-7.1 on the soil I checked