yes you can. mg is just fine, thats what mine is in. Mg soil does have some nutes in it and most people over do it with more nutes at first then bitch about how shitty it is

Now that you did a upcan let em grow in the new stuff for a week or 2 then start feeding 1/4 strength nutes. you will save some cash and they will love it.I have master kush in hydro to,it grows good at 1400 ppm but likes it closer to 1200 ppm in mg dirt. Cloning seems to be easy in dirt but a real bitch in rockwool for this strain.I also notice that MK does not like temps above 85f. any questions just fire away, not alot of info on this site for some reason.