I had one already. It caused me no end of stress and worry. LOL
they require high light, perfect water conditions and have on ocassion eaten fish.
I kept mine for maybe 2 months then returned it. It also will move and go where ever it wants, mine decided the entire left side of my tank was where he wanted to be. He literally took over a third of my tank when he was open.
My clowns never hosted it either so no big loss. They did host a coral to death almost so theres that. LOL
I just think the nems belong in the ocean I guess.