leaf tips dying, and other weird shit

first timer trying hydro and dirt.
1000w hps, light temp 70-80, no idea humidity level.
On big plant, tips of leaves just starting to turn brown(only tips at this point). using Sunshine mix #4(transplanted to larger pot a week ago).
small plants not of the same variety.Started in peat pucks and placed in tray of dirt. had powder mildew but treated and retreated a second time.just transplanted into hydroton with some dirt still attached to roots(mostly shaken out.
drip feed 1 gallon an hour. ph 6-6.5
Hydrofuel groei A (3.5-0-3.5) and B(.7-.62-1.9) running 24/7.

looks like decay maybe
if this werent a hydro grow id say the result of bugs

fried at 420 said:

looks like decay maybe
if this werent a hydro grow id say the result of bugs

Click to expand...

no bugs, but ehat about the dying of the leaf tips?

What's your water temp? What type water ( Tap, distilled, r/o). PH for hydro is a bit high for my taste. I like it at 5.5-5.8. Pic # 3 looks like clawing. You may have nute lock out. High Humidity causes powdery mildew. You shuold have humidity at 60-70% in veg. and min. less than 50% flower. I use a sulfer burner as preventative measures against molds.
Good Luck, DH

water temp 65-70(guess)room temp. using bottled water