my plant has yellow tips on leaves, & twisting on 2 lower leaves. its a 3wk old NL, growing in a hempy bucket, useing 1/4 strength nutes, w/ a ph of 6.2-6.3. the white spots are perlite dust, & the rusty looking lower leaves is from putting it outside & it got 102 degrees out when it was about a wk old.
yellow tips are a calcium def, check your nutes for calcium the twisting I believe is PH related, if there is no soil under the perlite drop your ph to 5.8-6.0
no soil, just perlite & vermiculite, & was told to keep the ph of a hempy bucket around 6.2, any truth to this.
I agree, those leaves look like a pH problem that I had when I had a failed attempt at hydro. Plus im not very familiar with the hempy bucket, but if there isn't any real soil the pH should be a little lower as previously suggested.