OK, I live right next to a lake and at the lake there are these rock that look almost identical to fiji liverock. there are some flatter ones that look like liverock, but I don't know what kind. Anyway my question(s) are can these be used to grow liverock? How do I clean them? How do I go about growing the liverock? And how long will it take? You see, i'm looking to start a 15 gal. salt tank so would like to grow some for it, as well as grow some to try to sell to the LFS.