I have had a small group of neolamprologus multifasciatus for around a year now and they have been doing great up until a week or two ago when I saw one of the fish flick itself off one of the shells. I thought nothing of it but as time went on i saw it happening more often and they seem to be 'flicking' more frantically. I have an idea that it could be gill flukes but does anyone have any ideas or have had a similar experience?