Leaf curl... proper posting

[Rusty Trichome]

Does it look like heat stress? I had used the 'back of the hand test' and the temperature was not that hot at the tops.

Nope. Not a heat issue. Put the lamp back.

The room shares space with bubba kush and cheese. Only the bubba kush (which has significantly wider leaves) has shown this problem.
It's not widespread, only a few leaves, and the others seem happy.

Old leaves are old news. If the new growth is fine, they'll be fine. Might have been something you sprayed or an additive you used during or just after rooting. Was the plant that the clones came from yours? If not, it might have been adjusting to your nutrients, light, schedules, water...
But it does look like they were over-nutrified at some point.

I was going to leave the effected leaves in place until they fell off, should I remove them?

I usually let the plant discard the leaves, and pick them out of the pot. If they are still green, they're still doing something.

Your nutrients and water:
12) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...)
General Hydroponics PH up/PH down

You shouldn't need both unless sourse water varies.

13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule.
17-7-18 supernatural Gro aqua

I'm unfamiliar with the product, but have you checked online for a feeding schedule? Ya might want to check HERE.

14) How often are you watering between feedings, and how much per watering?

4x per day for 15 minutes (ebb and flow system)

15) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...)
Cal Mag foliar once per week.

16) Are your ph levels stable, or do they fluctuate?

I start at 5.2 and they tend to rise over the week to about 6. then I change the water.

Perhaps the PDF I refered you to would verify the schedule. I'm a soil guy, and water once daily in the summer.
I prefer molasses instead of CalMag now-a-days. But CalMag is ok.

Keep an eye on 'em, verify your schedules and such, and good luck. :thumbsup:

Also, there is a hydro troubleshooting form just below this form, on the page you got this one from. (in case you need it again)