Mine stayed hidden, or hovered just near its cave, for about a week. Then it started coming out more, hovering. Then I added a Marine Betta...and it's been again hiding a lot. Not sure if it's just because it saw a larger roommate or if there was some aggression when I wasn't watching.... I'm hoping it's the latter and it'll start coming out again! But it does get spooked easily and dashes back into its cave. (I have the Purple Firefish.)