What am I missing here? Also noticed fins are a bit shredded on one of my older PJ cardinals. I have noticed that my Bi color blenny is very territorial. Could he be messing with my other fish while im not looking? He is a dodgy little guy, always sneaking around the rocks. When I come to the tank he is wagging his tail and looking at me all googly eyed. The PJ cardinals sleep under a ledge, not too close to his den. Blenny is active at night when a house light is on. The PJ,s are half asleep.