when i got them they were clones. That was thursday, november 22nd. They were 3 weeks old and about 14" tall. I transplanted them into 20% perlite and rest promix with mycoride-3 gal bux. I put them under 600watt mh 18" from canopy. walls are just drywall color not painted. humidity is staying low around 38% at times. that is at plant level as i have 3 thermoms and 2 hygrom at different levels. At head height it has never went below 40%. At plant height where it is warmer it is lower by about 4% rh. The intake air has no "draw" just a 6by 12 hole cut into drywall approximately 8" off ground with a screen closing it off. I have a 6" whole in the wall closest to rear of maxwing reflector. this is for an inline fan/carbon filter. For right now i don't have the fan/carbon filter all i have is a big strong ass fan screwed into joists and blowing air out.
humidity dropped about same time they started turning brown at tips.
i fed with recmmended dose of advanced nutrients iguana juice grow.
I added piranha to feed as well by following directions on bottle.
Each time i put water in them i was adding ph tap water of about 8ph.
leaves getting worse about 2 days after feed.
think it is deficiency and flush with 15 gallon of adjusted tap water to 6.3/6.4. last night monday nov. 30th. fed with 1/2 strength iguana juice grow and 1/2 strength piranha both by advanced nutrients.
leaves look worse today.
basically, i flushed each 3gal plant with a 5 gallon bucket of adjusted water 3 times. during the third and final bucket of each flush i took a 2 quart container with iguana juice grow and piranha both at half strength and poured over soil. this was done only after all water but the 2qt container had drained into sink and sat idle for about 20 minutes. then last pour had flush. Last 2 qts of each 15 gallon had nutrients added with adjusted ph of 6.3/6.4.
pics: the first is from 11/21
next 3 from 11/26