I've got 5 plants about two weeks old in 5-gal buckets. They are in a space under my stairs, 7 feet x3 x 5 feet. I have a 400W hps light on 24 hrs a day, i suplement that with a "aqua glow 15w light" for about two hours a day. I'm using foxfarm soil with perlite added. I've got the walls covered with aluminum foil, flat side showing - yeah i know, but its what i've got on hand. The plants are all 3-5 inches tall and i'm wondering when i should use nutes on them. I've got some mg that says is 24/8/16. I know its not the best but again its what i've got on hand. I have a small fan blowing on them to move around the air even though there is no problem exchangin the air. I've been reading alot on here but am not really sure how far to dilute the mg. The temp seems to stay around 77 degrees all the time. Any advice?