or go with a base formula with less N and use calcium nitrate to balance the N.
like the jacks ratios that are meant to be combined with calcium nitrate
http://www.jrpeters.com/Products/Hydroponics/Buy-Hydroponics.html
like the jacks ratios that are meant to be combined with calcium nitrate
http://www.jrpeters.com/Products/Hydroponics/Buy-Hydroponics.html