

what's happening?
what could be the reason for the sudden browning of the leaves at the edges? i swear they weren't like this 4 hours ago. i water one time a day, keep them outside in the sun (~24 degrees celsius). I also added a stick universal fertilizer 4-5 days ago (cut in half, placed on opposite sides of the container and near the container edges).
Also, all of my tomato plants seem to be a bit droopy (second picture). They were never droopy when I kept them inside. I should mention i started putting them out in the sun for a few hours a day, then for the whole day and inside at night and this is the fiest night i plan on keeping them out. Does this look lukewarm a problem or am I overthinking?
they are cherry tomatoes. any recommendations will help. I'm new at this, I've grown them from seeds and I really don't want to fail them!:)
thanks!:)