Couple quick shots of one of my large male Midas cichlids.
I generally will set my lights...in this case three, one on top, one below waterline of tank and a small kicker light to the right...put the camera on a tripod, zone focus on an area using a very high aperture to maximize my depth of field...draw him in using a hand mirror...and take the shot with a remote trigger.

I generally will set my lights...in this case three, one on top, one below waterline of tank and a small kicker light to the right...put the camera on a tripod, zone focus on an area using a very high aperture to maximize my depth of field...draw him in using a hand mirror...and take the shot with a remote trigger.
