help diagnosing plant problems

It looks like overwatering to me, but before I make a conclusion how much are you watering them?

Looks like it needs some nitrogen to me.

looks like a little bit of nute burn and maybe alittle of needing more light. Are you spraying your plant with water? if so, stop. Just let the soil dry up and if you have a low heat light, like a cfl, get it about 3-4 inches from the top of the plant. Do a heat test with the back of your hand and put your hand right above the top of the plant and make sure the light heat isn't too hot. I use shoplights (T12) to initiate seedlings and clones and I keep the top of the plants damn near right to the bulbs. The light just has to be adjusted everyday, which to me, isn't a big deal. That tells me the plants growing and I can tell how much every day. Its a good way to keep log of how much your plant does grow on a daily basis.

the plant is in the ghe aqua-farm, its being watered hydroponically
does nutrition burn means it has too much or too less nutritions?
how can i add specifig nutes to the water? right now im using the ghe nutrition series mixed with the water and i try my best to keep the ph at 6
(i was told the air pump is adding ph to the water is that possible?)

Im not sure about the PH in your situation. Could have something to do with it. Nutrient burn is caused from over feeding it with nutes. What you might want to do is get a flushing agent, if you don't have one and run a flush on it to get the nutes out and start over, but wait a couple weeks to add nutes again. The plant could have been alittle immature when you added them. If you run hydro, clean your container that holds your water and nutes with vinegar and warm water, dry it out and add the flush agent (flora kleen) that should get the build up out