HI i am a newbie when it comes to this so sorry if this is going over a old subject but i cant seem to find any other blogs that match my problem. my plants are 2 weeks old there about 4 inches and very bushy they looked great until the other day i noticed a little black spot in the middle of one of my babys i really didnt know what to think so i just let it go now 1 day later the plants is dropping down and seems to be getting a blackish look threw the leaves ( this was my best plant ) then all the rest seem to be following in its foot steps ive got them in clay balls hydropnoics with air stones water coming up to just a 1/4 of a inch of the rockwool cubes so its just keeps them wet not drenched. ive got them on half strength advance nutirents with water at adjusted to 6.3 under a 400watt hps grow space 3x3 with fans in and out it says temps at 25 to 28 degress cels and humity between 50 and 60% also on the other plants leaves seem to be curling up and ive noticed alot of mixed coulors starting to happen. also ppm starts at 400 but after day goes up about 70 i know that means its sucking in more water. also one plant i had few days earlyier got brown spots on its leaves and looked like shit i destored it. i thought it was just a bad plant since it was like a runt of the pack but now im starting to think maybe im being a bad parent to my babys and i didnt relise SOMEBODY PLEASE HELP. sorry cant get a pic of them