First Grow. Odd leaf curling. Ahhhhhh!!!!!!!!!!!!!!!! Plz Help

Hey so i went to chek on my babies today and the leaves on one of plants had like rust looking spots that were kinda see through and a couple tiny holes in two leaves.

The other plant had two leaves drooping down at the end and turning a really dark green. I'm pretty sure it's not over watering cause i only water every 3 days or 4 and its been really hot lately and they have been drying out fast.

Any help would really be appreciated ! .....Heres the pics

Leaf problem: Not enough moisture, Mary likes her humidity between 40% - 50%
Solution: Cool Mist Humidifier/De-Humidifier or place a cereal bowl of water in your grow area

Holes in the Leaves problem: Could be bugs, I don't know of anything else that would create holes in your plants leaves
Solution: Buy a 30x magnifier, distinguish what kind of bugs you have(if any), but an insectisoap formula and spray

Could it be under watering do you think ?????

just get used to the dry weight and wet weight of your pot to determine if it needs watering or not