FFOF usually has enough to carry through the first couple of weeks of vegetative growth, but when you mix it with coco 50:50, you're cutting that down a bit. Don't worry about the whole monsanto stuff, you'll grow fine in it this round and then be prepared to recycle it for future grows. the foxfarm nutrients are salty so be prepared to monitor your pH a lot.
You can always go easy on yourself and use neptune's harvest or some other fish hydrolysate along with some kelp based plant food. Get a bag of earthworm compost (EWC) and mix some into the top couple of inches of soil in your container (aka top dressing with ewc).
i'd also recommend getting some 200x aloe juice flakes so you can reconstitute the aloe juice and spray your vegetative plants with it once in a while (foliar feeding) and also use it as a soil drench once in a while. its a good plant tonic.
look into the organics forum here especially at the AACT thread to get some good microbial life going in your medium. take care of your microbial hoard and they'll take care of you.
good luck and read up! there's plenty to learn! (if you're really interested, get a copy of lowenfels and lewis'
Teaming with Microbes)