I'm trying to grow SPS and in a previous life I introduced some mushrooms and palys to my tank. Now they have grown out of control and are stinging the SPS. I took a lot of the rock out and replaced it with "virgin" live rock. If you are starting a softie tank you may be interested in this. It has mushrooms, worms, pods, starfish, etc. Some of it even has some places that are encrusted with Montipora and Acropora. I'm guessing it is somewhere between 50 and 75 pounds but it is in 6 pretty large pieces. $6/pound.