Just wanted to make a comment on blennies-I have a bi-color blenny in one of my tanks and he is a STINKER!!! Thinking of putting him in the sump because he will bang, bite, and nudge snails off of things just to sit and wait for them to try and tip over. When they do--LOOK OUT! Bam! In for the attack. Added 25 new snails last week. He apparently doesn't like them, or rather does! I'm down to about 15 from the original 25. Just interested in hearing other people's experiences with these stinkers!
I have a Midas Blenny (Penny) that is very territorial. I added a couple of new hermits to my tank and they traveled to Penny's rock. She quickly picked them up with her mouth and threw them into the sand. She did this constantly for the first week. Now she pretty much ignores them unless they are really in her way. The smaller hermits stay away from her as much as possible.