Yeah man if they are almost a month old you should be ok to give them nutes. Hell mine have been in that MG 3 month slow realese soil since they sprouted in it and they made it.

But im sure the nutes in tha Mg soil arent as strong as tha stuff ya mix in tha water. So just give them 1/4 of what it says to give them and slowly work them up to a full dose so ya dont burn the ladies burnt ladies are not happy ladies lol.:thumbsup::thumbsup::stoned::stoned: