I have jsut started growing myself and the cal-mag i been doing 5ml per gallon of water and the pro-grow I was told by the local hydro shop to use 1/2 of what the directions said. I did full strength and my plants did not like it all. By the 4th week I work up to half strength of what directions say.
But than again, i am just starting and maybe someelse can give more input on it.