NEVER grow at 24/0.........ALL cannabis plants NEED "sleep" for a correctly functioning metabolism and to finish their daily photosynthesis cycle.
A plant with an incorrectly functioning metabolism will always have problems..........18/6 is optimal!
Since you don't list any fertilizers in your diary, it is impossible to say what is causing the burning, but cal/mag at 10ml per litre, is most probably the cause.
Bio Bizz recommend approx 0.5 - 1.0 ml per litre!
You may have a substrate with excessive calcium, which will prevent the avilability of other nutrients.