I have added Sea Cucumber, Peppermint Shrimp, Molly Miller Blenny, and rock anemones from Port A with great success. All are still alive and well.

The Sargassium Angler was more difficult, only ate live food and tried to eat anything in my tank that wasn't twice as big as him. His mouth opened wide and he lured fish to him. Also, he sat in my Candy Cane hiding until all 15 heads died.

File fish was my mistake, didn't know he ate corals. Had to re-home him.
I was told by a local expert to check the inner lip of snails shell, if it is jagged throw is back, smooths are keepers. I'm not sure how scientific. He also said no crabs, ever.

Don't forget your fishing license and no selling.