I have a 40 gallon tank with plenty of wood / hidey holes for the fish to hang out in. I have a male M. johanii, and figured I'd get him some company, so I got a female yesterday for him to hang out with. I also added a chinese algae eater, and a rainbow shark. The algae eater appears to be doing fine. The female cichlid however has been in a corner of the tank, near the top, swimming almost vertically, just sort of hanging around. If disturbed she swims away, at a normal keel. But she returns back to that corner and resumes the head down vertical hovering. The rainbow shark appears to be doing similar, but he's in a hidey hole, and resting on the inside of the structure he's making his home, so I'm not too worried about that. I tried googling but I see a lot of conflicting answers. Can anyone help?