Scotts soil ok??

Ok, so I just picked up a bag od Scotts Premium Soil last night, and was wondering if this would be ok?

It says on the bag that it has "continuous feeding for up to 3 months" which I obviously don't wont, but couldn't find any that didn't have this. So is this ok to use? Should I mix it with perlite?? I'm going to be transplanting my seedlings (currently in rockwool) to my 3 gallon pots for vegging, in which I will put the soil. Any and help is thanked!!

P.S. So far, I've just watered the rockwool with ph adjusted, chlorine dissapted water. How far into vegging until I start mixing nutes into the water?
 
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