He should be anchored already..they are the first anemones to anchor and stay put..you may not have enough light, thats why he's rolling. Yea feed it small frozen pieces, about the size of an eraser head, just stick it to him and he will do the rest. It shouldn't bother the gobie or shrimp or any other inverts.. my hermits, emeralds and shrimp climb all over mine, the shrimp are so light footed most of the time mine don't even know they are there, the hermits and emeralds are rough and molest mine constantly... they just pinch them if they get too sticky and they will close up quickly. Corals are another story..mushrooms will be pulled right off of rock and small colonies of zoos..but they will spit the zoos back out...I had a small red zoo frag float right into a large flower, two days later he spit it out, I glued it to a large rock and now is the best zoo colony I have. I would keep it..they are an interesting part of the reef and easy keepers as long as you have enough light. Once they find a spot they like they stay put.
