i just dont know... slowly deteriorating

some say its nute lock, some say its nute def.(potassium, N, zinc, copper), some say its the ph, and some say its bugs (what are those little grayish black gnat looking things ? are they a threat?) pics included, diagnosis plz... meh. 4th grow help the nub thx

*2 wks into flower - 12/12 from seed*
400HPS
6x6" pots
miracle gro moisture lock + organic fish/crab meal
85-95Deg F - yes i know too hot, working on better exhaust
not sure the ph, dont have a meter yet, using tap water let sit 48 hrs let chlorine disapate

i dont see any pics? and yes gnats are a threat but only to very young plants. the larvea and birthed in you soil and they feed on roots.

if you have gnats get a 2 liter and cut the top off about 2 in down and in put viniger and sugar water and lemon juice (optional but gnats are attracted to the color yellow) about a cup of sugar and viniger half cup of water and enough lemon juice to change color. then take the top and put it on upside down. tape if need to. and thats a homemade gnat trap.

had trouble uploading them, had to resize, they're there now

it looks like nitrogen burn to me?

deficiency's usually start w/ older leaves first and work from bottom to topfrom bottom to top.

yea.. the bottom leaves are fine, starts about the second leaf set, they look leatherly, papery to the touch, the veins are healthy green but the medium between the veins are discoloring, then toward the top they are curling from the tips and sides downward, and along the edges are slowly dying/becoming yellow/brown and crumbling to the touch

thx... ill look again. but like i said.. ive heard all this before :-\ sry about the lighting