Hello, so yesterday, I went to my LFS who tested my water and I got a blue lincktia and two Trochus snails to help with algae, anyway, from out of nowhere he came out with a black brittle starfish and he said he got it has a hitchhiker (We cannot get them here in Australia) so I was bloody excited. But I did some research and it says it is reef safe with caution and that it is semi aggressive. Will he hurt fish or coral or should I keep him well fed?