Thats what I do. 1 inch to start then graduate to 4x4x4 and do e&f and so far not a prob (knocks on some kind of wood). I will be looking into new stuff called Sure To Grow but since only comes in case lots it doesnt fit the budget as of yet.
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tinytoon Reviewed by tinytoon on . Can rockwool melt!? and no, not by fire :) Acidity. The hydro shop owner said if I have a PH of 5.5 or below, my 4-inch rockwell cubes will start melting and shrinking...constricting my plants...therefore...killing them. Any truth? Rating: 5