ok so ive got several plants about a foot and a half from a 400 wat mh and they are sitting in a 2 part happy frog one part perlite mix. i water every 4-5 days with distilled water and the temps are between 73-80 usually with about 40 percent rh. i also have a fan blowing while the lights are on. at first some of the leaves started to curl down and got a little droopy so i i thought overwatering and i cut back a bit. then i noticed that a couple leaves were also curling upwards and were cupping a little bit. about a week ago i seen some light green spots on the leaves that looked like the top layer of leaf was missing in patches. the patches look like they are slowly turning yellow and today i noticed a little bit of brown on the very edges of a few leaves...the plants are just over 3 weeks old and i havent used any nutes.