I just purchased finally, a 6 inch male dovii, he is in there with a female thats about 4 inches, anyways, he is really really passive, all he does is hide up behind the filter??? this being said i just bought him today, but still id expect him to at least swim around and check out the surroundings........ the only time he is not scared is when my lights are off and no one is moving around in the room, is there something u can do to make these guys more aggressive??? or not so scared???