[BoomerD]

I went through the same thing. I started with 2 pieces about the size of a silver dollar. Within a year, it had completely covered one HUGE rock, and was spreading fast to the other rocks. It DOES look nice, almost like grass waving in the breeze, but given a chance, it will take over all the rocks in a tank fairly quickly. Some people are able to pick it off their rocks, but it's a time intensive chore. If the rock has lots of crevases and "bumps", you may never get it all off, and it will continue to plague your tank. I considered using a blow-torch on more than one occasion!