They are sitting that low right now. The problem with moving them higher is that the water doesnt wick up enough to reach the roots if I set them higher. Some light does get in but with how I am growing there is no way for anything to grow in the
nutrients lol. I have it maintained to pool standards and also have UV lighting in the res to ensure nothing tries to grow. The water is still crystal clear after a few weeks.
I think there might be an advantage to it with using bleach (it works like a PH up). I set the PH a bit higher than optimal with the bleach and in 2 days it scales through the entire range the plants take the nutrients in.
I would like to get the plants higher, but with my current methods I am stuck with what I am stuck with. I am wanting to change it up a bit, but that will have to wait a little while until the money is a bit more available to let me do so.