Yellow with brown spots and curling tips????

Is yellowing with brown spots, starting with the bottom fan leaves, but also present higher up (the yellowing starts at the tips and then brown spots, the yellow moves up the leaf, and the tips start to curl.

Is it too hot, or do I need to give the girls a supplement? They have had a bit of Bigbloom and superthrive- too much? They are about 15 inches tall, and will start flowering in a few weeks- these are the bh triplets who sprouted early Dec, so not sure how old they are in veg time:o

I will post a picture tonight, but any ideas from the description?

Should I flush, feed, or move them away from the light (the top growth is fine)?
thanks!

What could be the problem?
PLEASE HELP:(

I DONT KNOW WHAT I WOULD SAY IS TO CHECK YOUR ENTIRE SYSTEM,EVERY THING IS SOUND

what is your feeding schedule? what nutes?

Whew- hi KP glad you're here! I fed them 1/2 strength Big grow a few weeks ago and then reg strength last week. They seem to be drying out pretty fast. Now, there were a few nutes (little green MG pellets in the potting soil I used to supplement the seed start mix...)in the soil when I first moved them into their big pots about three weeks ago, so maybe it was too much? Should I flush them?

i'd give them a good drenching, and see how the respond. not a full flush, but enough to thoroughly wet the soil. if you still have the probs, then flush; but i think they'll perk up after a good water.

kp