Your "base" rock would be best bought dry. Cheaper, can be used immediately, no pests. We LOVE what we just got from MarcoRocks. Six large rocks and a tiny bit of rubble (useful) in their 25lb free shipping package. Great stuff that doesn't destroy reefs. Check out their website for more info. BRS has some good YouTube videos about the same kind of stuff too.
Trust no one - The ich is out there.