the arrow is about the size of a baseball, i have way to many fish....purple tang, kole tang, 3 chromise, 1 firefish, 1 engineer goby, 1-bar gobie, 1-tricolor wrasse, cleaner wrasse, 2 nemo clowns, sally light foot, cleaner shrimp, arrowcrab, coral banded shrimp, flame angel,yellow shrimp gobie (the little ones)...i think that is it...way to many but everyone gets along....i also have 180pounds of live rock....forgot long nose butterfly