I have a aggresive salt water tank, which include a lionfish 3-4inch, a Picasso trigger 4-5inches (Known to eat small fish), Coral hog 3 Inch, Maroon Clown 3 inch, and a Yellow Foxface 6 inch. Now my question is, my tank is looking kinda of empty since my trigger ate all of the damsels that i used to cycle my tank with. my tank has been running for about 6-8months know, and i am wondering is their a fish i can put in my 75 gallon tank, that will school, but not get killed by the other fish, and has to be some what hardy.