i believe in g/h 3 part nutes also . either 123 /321 recipe or some folks dont belive in using the grow nute . i myself would go for the 400 hps cause your gonna shit when you see how well this works . and if your like most of us your gonna want to expand your hobby once seeing this .
i've also found that the larger airstones dont always work as well , u might want to add a tee in your airlines and run 2 smaller stones per bucket verses 1 big 1 .
peace