Nutrition deficiency

I'm a new grower I wanted to ask if it's possible to get some help from you guys because I'm struggling with some problems and I really don't have anyone to ask. My temperature in the grow tent 5 days ago went up to 33-34 degrees when I wasn't at home and my plants got stunted afterwards the same evening the leaves started turning yellow with brown spots on them and for 5 days they are not growing neither taking the food that I give them. I watered them after the shock with water one time at 5.8 pH level and then I flushed them with Flora Clean to take the salts away if there are any, but I think it got worse after I flushed them because the soil was out of food. I grow in coco coir and I was keeping pH level around 5.6 - 5.8 I think they have some nutrient deficiency because of the heat stress. I wanted to ask your opinion on how could I fix the problem. Should I prune of the yellow leaves and add a little CalMag to my feeding or what could I do?
Thank you.

she needs food. full diet , not just cal mag. The heat for one day will not cause all that. (thats not even that hot)"flushing" while already deficient is the reason she is not eating. Give her a full dose of food and she will suck it up fast! Good luck bud!

Those are small pots. Sounds like it got hot and the coco dried out too much. Feed half strength nutrients and bump those up to full strength over the next couple of weeks. Don't flush them with plain water. You should probably transplant into a bigger pot within a week. Precharge the coco before you transplant.

Should I add CalMag to her diet with the other supplements?
Thank you for the information guys!

And should I prune the yellow leaves off or should I wait until she recovers a little bit

Leave the leaves for now. Give it some food and yes you can add a little calmag at half strength along with half strength nutrients. But you really need to get that plant transplanted into a bigger pot with some fresh properly precharged coco. If you do that it will start exploding with new growth after about a week.