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Looks to be mite damage on the clone. I wouldn't be introducing that clone to my garden, you're likely to loose your entire garden over that infected clone.

Post a pic showing the bottom of the leaf and the brown eggs...

Springtails!

I wouldn't do anything drastic. Just cut back on the on the nutes. Don't use any nutes on the next watering then use about 1/2 - 2/3's of what you have been feeding and adjust from there. Good luck!

The plants are a little over fed causing the burnt tips.

Like thumper said, that appears to be pest damage. Post a photo of the underside of the leaf.

Nute burn and getting lockout/deficiencies from being over fed.

Over fed... Over feeding is responsible for the extreme burning and deficiencies/lockout. How much are you feeding?

They're too small to transplant this point. You should see plenty of roots prior to transplanting. I notice that you're using clear plastic cups, roots don't like light. Either wrap some dark tape around the outside of the cups or put the clear cup into a colored cup to hide the roots from the...

Where did you get the clones? Is it just the clones or are there other plants? If it's just the clones I would get rid of them, clean the room, clean the room some more and then start over using quality seed.

I don't know about that, not long ago I had a 12"x24" dark room vent (similar to your vent) for my intake and a 6" Vortex for the exhaust and it worked well with a 400w setup but the temps went into the high 80's (from the low to mid 70's) when I upgraded the light setup to 2 x 1000's. I changed...

You may want to try a speed controller on your exhaust fan. I use speed controllers on both my intake and exhaust fans. It really helps control both the temperature and air flow. Try to keep the temps in the low to mid 70's. Like Hookah said ^^^, I wouldn't give any nutes quite yet, the new...

Ditch that passive inlet and install an inline fan with a speed controller. I'm using a 6" Vortex exhaust and another 6" Vortex for an intake, both on speed controllers. The speed controllers should allow you to dial in the temperature and air flow.

Looks a lot better. Temps are running a little hot though, can you get them down to the mid 70's?

I would just check them once a day during the remainder of stretch and adjust the height of the plants as necessary. Try super cropping a couple of plants and try tying down a couple more and see what works best for your situation. Try drilling a hole through the rim of the pot to tie a string...

Possibly broad mites which are much smaller than spider mites. Jimmy's correct... Plants are too large for those solo cups and you need to transplant but I still think you may have mites. Do you have a magnifying glass? What do the roots look like?

Yes, they will usually stretch from 14 -21 days. I would get the light attached directly to the ceiling ASAP. Put the shorter plants directly under the light and the taller ones around the edges. Re-stake, super crop, tie-down if the tops get too close after ^^^^

It looks like you could raise your lights up another 10" -12". Try removing the rope pulley's and attach the light directly to the ceiling.

I agree with Alien and Broand... looks like mites:(

Please don't start feeding at 1/2 strength and the plants aren't deficient in calcium or magnesium, it was the 1/4 strength feeding that burned the one plant. Fox farms soil has enough nutes for the first month or so of the plants life. By giving them additional nutes it burned one of your girls...