leaves look burnt and yellow spots

ive got 4 plants going, theyre in flowering, and on 3 of them some of the leaves have started to show yellow leaves, as well as the edges of some of the leaves look burnt and dried up. i had a BIG fungus gnat problem but its pretty much under control as of 2 days ago...so i dont know if that screwed my plant up. here are some pictures...please help.

looks like nute burn to me bro, wuts ur feeding schedule?

right now im feeding them every 2 days. i had a feeling it may be nute burn, but i just wasnt sure. so should i just feed water for the next few feedings?

well if your able to do it, i would recomend to do a flush.(water with 3x more water then soil) then continue your schedule just with 1/2 strength nutes first n maybe 2nd watering.
do you ever give them clear water or feed every time?

i give nutes every time, with the exception of the last feeding, i gave them just water cuz i had a feeling it might nute burn

yea man, you should give clear water every 3rd or 4th watering IMO. the plant doesnt use all the nutes from each watering, and salts build up, changing soil PH and causing problems like nute burn.

ahh ic, well hopefully theyll be ok, ill continue to give clear water until they look healthy again. thanks for the help

yea bro theyll b fine =] MJ is a tough plant lol