what it do? Ok here is my sitch. i will have pics soon but i need to talk it over with some one. I have four plants. they are 6 weeks old, and pretty big. at least two of them are. the other two were late to come up and are a little smaller due to getting blocked out by enormous fan leaves. I have two flourecent tube lights on both sides and a 150 watt hps. i just started with the hps to help bring light to the lower leaves. if that makes sense. i dont have an air stone. will that make a big diff? and I also dont know anything about ph testing. help me dude. i really need it