Leaf discolouration spots! Help

So I've been really busy and the plants have been only minimally observed. There are rust coloured spots on a number of the bottom leaves on one. There is a slight sign of a similar effect on one other. The third plant looked fine.
36th day of veg.
I did give them nutes-- maybe a tiny bit aggressivly. Also the temps in the case had gone up about 10 degrees (hit around 90) for a half a day or so. I haven't seen any visible bugs. I've looked around at every other plant photo I could find in the last 4 hours, but nothing looked like a match to me. I'll fog them if I have to. I'm leaving for 10 days, and need the prob dealt with before the babysitter takes over!
These are only on the BOTTOM leaves!
Thanks Soooo much for checking these out.

that looks like the nutes and a combination of the rise in temp burnt them, but they still look healthy, when are you leaving?

I have about a week to figure my shit out. Then dear hubby is going to water them, and nothing else. He basically said it's my project and he doesn't know shit.
I'm delaying flowering until I come home as well. Sigh.
Does burn just show up in random spots though? Hope that's all it is.
GG

dont worry bout it..your plant looks very healthy and can take a little spots on the leaves, im shure within 2-3 days itll look even better