1st time need a little help

Hi everybody. So I am running my first op other than a few plants I tried to grow last spring. I am using a 30 gallon tank for a continuous drip hydro system.

Yesterday I noticed the leaves were curling down a little on what seemed to be very healthy plants, and upon further inspection I noticed some small yellow spots that seemed to look like an inkblot. I decided to check back again this morning and after doing so there seems to be a little spreading in the yellowing, and a few more leaves started to droop.

I raised my 400 watt hps light to about 20 inches, and diluted the nutes a bit. I also make sure twice a day that the ph level stays right around six.

I am a little worried about heat in the room. For a long while it was a comfy 70-75 degrees, but there was a sudden drop in temp the other day to maybe the high 50s. I corrected that but dont know if it could be related to the changes Im seeing in my plants. Also, Ive noticed some small bugs that I think came in with my potted plants. Ive killed everyone I see and plan on continuing to do so. Still, Im a little concerned and am wondering if you guys and gals can take a look at my pics and tell me what you think.
 

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