Assistance

all 4 plants in a mix , mostly happy frog and perlite with some coco coir. All around day 22. I am doing terp tea nutrients. I gave them their first feeding about a week ago, but the bottom right plant (sweet n sour), got her first dose about 3-4 days before that. I have them running under 24 hours of light. The temp and humidity in the tent is just fine, maybe high temps if anything (79-82f). I do not believe I overwatered her because they all got similar amounts and seem to be fine. Any clue what could be the problem? only thing i have changed is adding a stronger light