I never seeded, just what came on coral plugs and the clean up crew.
How old is your tank?
I didn't get much for the first 6 months and it was slow going until parameters (pH, alk and cal) stabilized. Now (1.5 yr) every inch of rock is covered and it's a battle to just to keep the flow generators clean.
It's a pain in the ass when it's getting in things you want to keep clean... Careful what you wish for, it will come on it's own, when conditions are right and stable.
Good luck.