New grower needs help

the plants are aproximately 3 weeks old and have been very healthy up until now. the leaves first started on one plant to turn papery and seem dryed out, they are growing in a cabinet with flourescents all around and it does get pretty warm in there. i fixed this problem and also took the plants out for a few days and it helped nothing. i then thought it was a k problem so i tryed misting fertilizer on the leaves to see if it would pe a temporary fix if so i would know that k was the problem. still nothing helped, the problem isnt terrible im just trying to fix it before it got to bad. then today i noticed that the edges of the leaves are brown and burntlike and curling down and the sides underneath but with full color in the leaves. the top leaves off of the new shoots are turning a verry vibrant yellow. i have just tryed flushing the plants and am waiting to see if it helps. i filled each pot till it almost overflowed 6 times and let it drain till it stopped leaking out of the bottom, then repeat. it anyone can give me a pointer or tell me anything i am doing wrong i would greatly appreciate it. the indeca im growing seems to bell less effected by this but effected all the same.






any and all pictures or information given out by me was taken off a readily available internet website and in no way should anything i say be taken truthfully,

have you been ph'ing ya water?the yellowing could be nitrogen deficiencie,,,if the ph is all wrong then that whats causing the problems,it could be nute lock,so youve done the right thing flushing,but i hope you flushed with the right ph water?the next time you feed make sure you ph the water after youve put nutes in it!peace

where can i get a ph test kit. i need it soon so would home depot or something have it. shit, wal-mart has everything dont they? haha, also i used to boil my water because the water around here is very minerally. and then i would add water solulable nutrients to it the next day in the propper drops per water volume ratio. should i not boil and just let the water sit out? im all ears anybody.

hmm they dont look bad at all to me....

as faras the ph tester idk .. im a lifeguard and i took an extra tube tester and chemicals haha for the y of mca lol

let the water just sit out,,,,do you know the ph of the water youve been using?is important you know coz if the ph is fine,before and after youve added nutes to it then it may not be the early stages of nute lock,,,it might just be a nute deficiency,,,,if you dont live in the uk i dont know where you can get a ph reader from,,,,your plants are a healthy colour,apart from the yellow leaves,but that alone could just be nitrogen deficiencie which would be very easy to fix,its just the leaves curling UNDER that im worried about,,,,