Three different problems maybe?

http://imgur.com/SJzJZ,1z0J7,xz0Jn#0

Those are three different plants, running two different 1000 watts, room temp usually 72-80, using ?ph (not)tested tap water (letting it sit for 24hrs my bro thinks theres a point), watering usually when we notice a little droopyness(every 2-3 days).24/0 hour light schedule. have used nutes for three waterings, noticed some problems, then just flushed them last watering yesterday. the lights are hps/mh.
let me know any other infos you want

mainly concerned with the middle picture (the upward/over curling leaves) as many of my plants have this. could it be heat stress?

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