Wilting leaves, but only the bottom little ones?!?!....

So my plants are almost in their 3rd week of flowering, and the bottom leaves on one of my BEST plants have started to wilt/droop really bad. *** I have a 600WATT HPS light (which is on 12/12 now), I grow in soil (scotts), and i use Dyna grow bloom nutrient (3-12-6) (<not sure if thats the best....???) . Its always around 50-60% humidity, and the temp is kept steady at 72. I water them once a day. ***

The plant that is doing the wilting leaves is actually a clone (white widow). I have also taken 3 clones from this clone, and one from another plant...and all of the clones have now started to droop in the same way (they're in their 2nd week of being cloned).

Also wall, about 3 of my other plants are showing problems on their big leaves....they have some spots on them, and then they start to crisp up, and look like the spots on the leaf is dead?? I didnt think it can be nutrient burn, cause i only put in 1/2 tsp in a whole 12 gallons of water. Maybe i have the wrong nutrient though??

Ive attached pictures.... The other plants i have are just seeds Ive had. ANY help would be GREATLY appreiciated. I am new at growing indoors, and im trying to do good!

(the first two pics are of my adult clone, the third is a pic of my young clones, and the last is the pic with the 'burnt' leaves.....)

PLEASE help!!!

Clones need to be kept in a humidity dome at 90% humidity. I don't know whats in the soil but may be too nutrient rich for the little babes.

For the flowering plants, raise your temps to 78 which should lower your humidity to 40%... You said your watering everyday?? The plants are over watered. Wait for the soil to become completely dry before watering again. If you keep watering the roots dont need to grow to find water, therefore the plant wont grow.

Thank you so much!!

Will my little clones be okay if I change their humidity now?? or are they already dying??

As for the plants with the 'burn' on their leaves.....is that a sign overwatering?? or do i not have the right nutrient?

Thanks again for all your help!!!