I have a gold wolf fish for 5 days now was a replacement for the red wolf fish which died after 2 days pf purchase . I know I read some where that wolf fish specie are nocturnal well this gold wolf is very during the day even with aquarium lights on but I notice that it sleeps during the night once all lights in the house are off . If I am about it will follow me across the tank very personable, at the moment at the bottom of the tank sleeping like a cichlid.