I have a 10g reef with 6 red legged hermits. The largest one (2cm shell) roams around and bullies the smaller guys (1cm shell). He'll flip them over and claw at them inside their shells. Of course, he doesn't bother the very passive and larger electric blue in the tank. Is this aggressive behavior? Mating? How can I teach him to leave the others alone and just play nice?
10 G marine reef
1 chromis, 1 false percula clown, 7 hermits, 2 snails
pumping xenia, ricordia, button polyps, green BTA