Leaves turning yellow and dying help! Week 4 Flower *Pictures*

Today is day 1 of week 4 of 12/12. I just got back from a week of vacation and found my plants looking like this. Before I left I fed them a balanced dose Dyna-Gro Grow and Bloom nutrients with B-52 and Bud Candy, in water with a pH of 6.5. Soil pH ranged from 6.3 - 7.0 across the board. They were prettymuch all green before I left. When I was gone my room mate fed them plain water every day so they havent had nutrients for a week.

Yesterday I gave them another balanced feeding of the Dyne-Gro line (1tsp/gal of foliage pro, mag pro, and protekt), as well as the B-52 and bud candy, and 1 tsp/gal of Big Up bloom booster from humboldt nutrients. ppm was about 1500, ph around 6.5-6.8.

I was thinking they are N deficient, so I was going to give them plain water with just grow nutrients for a couple of waterings to bring the green back into the leaves.

Any suggestions?

Here are some leaves I pulled off

Here you can see the yellowing







Anyone have any suggestions?

looks like nute burn, flush them and give them a low strength balanced feed.it might be P deficiency, but i doubt they would become that deficient in one week.

actually one week would be enough if your room mate was watering heavily

not nute burn, it looks like a few deficiencies going on. Make sure u r still giving N, of course ur K, & not sure if ur pro mag, is like calmag, but u should be giving those nutes as well.