Soil noob, help please

So I planted these GG4 autos in pro mix ultimate organic mix in what I believe are 2.5 gal pots. While they both don’t look great, my left one is the worst. Came home after a weekend away and had 3-5 big sun leaves curl upwards and die, off at a slight tug. Necrotic spots in middle and lower leaves and yellowing all over. This grow is more of an experiment to me at this point (I have my main hydro tent deep in flower doing great). I’m just trying to see if I can figure out the issue before it’s all said and done. Mostly watered with 7 ph tap water. 4 days ago I top dressed with some 10-10-10 all purpose granular fertilizer to see if it would help. Once again, this is a side show, not trying to spend anything if I don’t need to. Any pointers would be appreciated

They look hungry and thirsty to me. Possibly getting too dry between waterings in the smaller pot. I would feed a mild solution of bloom nutes with a little extra N and see what happens. The 10-10-10 will take a while to start working.