So I was looking around my tank today and I noticed one of my otos using his pectoral fins to hold onto a side edge of the hagen CO2 bubble counter. It's like he was saying, "look dad, no suckermouth!" Too bad he didn't stay long enuff for me to get a picture. Never seen a fish do that, closest thing to it is the walking on his fins that my gf's GAE does. Funny fish, always good times.*laughingc