It started probably around week 3. I use black gold potting soil, R.O. filter, Cal-mag, bud ignitor first two weeks, big bud week 3. Carbo load. and a local nursurys line of base 17-10-17. Drop my PH to 6 in week one 5.9 in week two and 5.8 in week three?
and you say it started when you started dropping your ph? have you tried to bring it back to 6? ... kinda looks like nute burn or lockout of some sort .. sorry couldnt be more help
