That's cool. But again, that is literally the best soil money can but. And I put an additional load of seaweed extract, bonemeal, and bat guano down deep for when it needs it. It takes time for the plant to break down the fertilizer, so it should be good for a long time. I would suggest giving it straight water for a while, then maybe some bloom about halfway through the flowering cycle.
If you add anything, go with some compost tea or worm juice.