Hi Zenon Neat looking fish !!! For the aquarium shots I might try less focal length and a rubber lens hood !! I like this pose with the great head angle ... just would like more room if you have it !!
Might want to set up in an area away from the bright corals which usually get blown !! Looking forward to the next one !!!!
btw there are lots of rubber shades available, look for the size and test it doesn't interfere. I use a Mamiya RB 67 Lens hood on my 100-400 .. neat and its collapsable !!