I have a mature 65 gallon tank with some easier softies and I'm looking at getting some more corals, and I happened to see something people do with Acans where they put them on the sandbed and it forms this really cool looking dome shape. I want to do this but I have two concerns. Are they just placed on the sandbed on a frag plug and allowed to grow out, or are they first secured to a piece of rock and then put on the sandbed. Second, I have a Diamond Goby and I'm wondering if this would immediately rule out this idea. I'm not really concerned about him burying the acans since he's pretty tidy and likes dumping his sand in these two specific spots in the tank, but I'm worried he might try tunneling under the acans and potentially flipping them or even getting himself stuck. If someone could clear up these questions I would really appreciate it.