Niger triggers are safe.If you want proof go to the w house and buy the dvd called sea world i think.(mines on loan).It is a movie of two diff reef tanks and realy well done.One has 2 niger triggers in it and cleaner shrimps.Yes cleaner shrimps(amazing).The other tank has archilles,powder blue,lipstick,sohal,blue tangs,tangs everywere.Its a dream come true for me.Its only 9.99 of course and worth putting in the collection.