The better your waters paramters etc are the faster they start to divide and mulitply. Give em a month or so to really settle in and get used to their environment, than unless you decide to manually cut and divide them, about all you can do is maintain proepr param's and set back and wait. I bought a pice of LR one day that caught my eye as being perfect in shape loaded with lots of coraline on it, and just perfect in every way for my passion.....2 gal or less PICO tanks. Two days after I put it in the tank I was amazed that it had lots and lots of flourescent spots on it when under a moon light.....It was loaded with tiny shrooms (Ricordea yuma).....now rock is in a larger tank as it was over run with shrooms, and it all took approximately 7 or 8 months from the day I got it. I could have cut some off, but I prefer to have them cover the rock up and spread from there, so it had to be moved to a larger tank. Occassionally some do float off so they are relocated to other rocks in other tanks.,