Your pH is way acidic. It should be around 5.7.

Are you having fluctuations from 5.0-5.5? (Your pH goes down and you adjust it up, then it goes down again - that type of thing.) If so, that's not really ideal for hydo. Are you using r/o water or tap?

PC :smokin:
PharmaCan Reviewed by PharmaCan on . Leaves curling up at edges Hi, I've been growing this Jack Herer from seed and they're just coming up to 2 weeks in veg. Its a hydro setup and they are under a 400W metal halide which is 11 inch from the tallest plant. They have only just made it to full strength nutes after spending the first week getting 1/4 then 1/2 strength before hitting full strength a few days ago. The problem though, is that most of the plants are showing this leaf curl in varying degrees. It starrted on the lower leaves but now new Rating: 5