Super Skunk Female Sick...No Idea why...Any help would be awesome

The plant just begun on a 12/12 cycle with 3 42w CFLs and a fan always running. All the tips of ALL the leaves are having these dark spots at the end of the leaves. I have no idea what it is. I have started the nutrient cycle with fox farms tiger bloom and it is in a deep water culture 10 gallon system. My only testers are pool ph strips and they read around 6.2. Humidity?....the room temp is about 76

Get about 3 or 4 more of those cfl's if you want to grow it properly. I used 7 for my 1 plant.

As for the problem...looks like burning from the cfl's...how close are they to the plant?...if it's not heat then it's a nute problem, what it is i'm not sure...never seen or had that problem before.

Ok i was looking at a website...it says you have nutrient solution burn. You used too much of it, don't give such a high concentration...give about 1/4 of the reccomended strength, and then work your way up.

If it gets worst its nute burn. If it doesn*t then I couldn*t tell ya'.