Cal defeciency?

It's best to fill-out the troubleshooting form, but they look starved, overwatered, and possibly rootbound.

I'm guessing the older-crispier leaves were a result of the burn? No way to fix those. Keep an eye on the new growth, and watch for any disfigurement or discoloration.

Do you have a source of calcium handy? A little shot of CalMag added to their nutrient schedule wouldn't hurt, but I'm doubtful that's the cause.

Did you stop feeding because they are in the Miracle Grow Moisture Control? The nutes in MG don't last forever. (three to four weeks max, on a mature plant)
MGMC holds moisture, so you have to adjust schedule to prevent overwatering and root rot.
How long have they been in the same container? (when was the last transplant?)
What kind of flowering nutrients were you planning on using, and when do you plan on resuming their schedule?
What additives were you giving?
What's wrong with your tapwater, that makes you want to use other sources?
Sativa dom's usually require less nutrients in flower, so likely it's ok with restricted nutes so far...but I'd feed them all pretty soon. In the next few minutes would likely be fine, but fill-out the troubleshooting form (and get an answer) before doing anything dramatic.

Have you found the proper use of your nutes, so you won't burn them again...? List the quantities and schedule when you fill-out the form. :thumbsup: