I have a older powerhead 802 set to discharge downward. My bi-color blenny has taken over the normal discharge tube as his night time hide out. Wont go there during daytime though finds other holes in rocks or hangs out laying on top of my many mushrooms throughout the tank. I have a good pic of the blenny peering out from a hole in the rock, havent gotten one yet with him in the powerhead though.
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