Be especially careful of some zoanthids. There is a strain, I believe it is some of the larger polyp zoanthids that are really poisonous. They release palytoxin when cut or smashed which is a nerve toxin and can make you rather sick. I have heard of a story where someones dog died after it got in contact with some of the poison. Try a search and see if you find anything on it. Wear gloves and you will be ok. HTH