What camera gear and settings are you using for these shots?
Was hoping to see this thread when I saw you posting in Pete's Uaru F thread, those Geos are looking amazing! Pity you can't sneak some young across the ditch, I'd love to get my hands on something other than the same old tired altifrons/leucosticta that is all we get here. What else are you keeping with them? At 20cm that big male would be large enough to pick off smaller fish like cories or tetras eh?