thinkin fert type prob

everything was goin fine. i am in process of turning from 18 to 12 hr cycle. thought it would be a good idea to fert with 11-31-15 before switching but a couple of days after ferting(still didn't have clone room finished)still on 18 hour my babys leaves turned brownish green. looked like fert lock but i only fert minimal. I've flushed my baby for a good 4 days,continuous 24hr only water, still on 18 hr but have noticed there is no growth. ? is was it the type of fert that caused my leaves to brown and how do you know if it's ok to fert with grow? would prov pics but don't have camera yet but by reading some of the other help probs i need to get one soon and will.
thanks for any help

hope they make it

My best guess from your pics that show what looks like advanced Mg deficiency is that you already had the conditions set up for this problem and the feed just puched it over the edge.
If as you say you only fertilize minimally you should look at your soil as a potential culprit.
Flush with distilled water and measure the pH of the runoff.
Flushing was a good idea and it's good you already did that.
You can get Mg lockout pretty easily, and flushing is the first step towards fixing it.
Now you are going to want to make a foliar feed that contains 1/4tsp/gallon of epsom salts and mist your plant with that.
You have to do it right away before you get bud formation, because then you can't foliar feed properly after that.
For flowering you should be feeding with a lower N fertilizer than what you're using too. Also if you find that your soil pH was off, you need to be adjusting your water.

tested ph and color was 6-7 range. also noticed through other threads that it might be heat? 90 in my room when light on. i have intake and am wondering if there is any reason i shouldn't point it at the bulb from a distance of 36 in min. right now i have it directed to the ceiling.

What do you have for exhaust setup?
You need to get a complete change of air in there often enough to carry the heat out.
That's a cabinet, right?
You're going to want to add an exhaust if you don't have one already, otherwise you're just sort of blowing hot air around.

i hace a charcol can & fan 1000 cfm going in and same going out

no its a 6 x 6 x 7 room 1000 hps

P.S im not goona flip her till she looks like ther babies. been waiting way too long. plus i did move the intake and the temp in my plant area is now 88 range not over 90. is it poss to graft the middle of the three to the one on thr right. 1st is northern lights second is white widow so is the momma(never grew widow before hope its good:cool:

Don't bother trying to graft. It's an annual, it will be more trouble than it's worth, if you don't get an embolism in the graft site and kill the plant outright.