For base rock check out Hirocks.com they sell mined ancient reef rock that is farily dense so it is not suitable for upper reef unless you do some shaping and drilling. my system has 120 lbs of hirock base and 80 lbs of fugi for the upper portion. i will seed it with some internet ordered live rock, cured and pay the extra cost but limited to 3 small pieces to seed system. I have not located the out let for seeding rock yet so cant help there. hope this helps.