The secret to getting these shots,without getting the reflections from the glass, is to have a rubber lens hood on and pressing it to the glass.
You are then firing directly at the subject, using the tank glass like a huge underwater housing.
This technique can also be used out of plane portholes and Observation Decks on Tall Buildings.
It’s best to shoot RAW. This will enable you to tweak White Balance, Exposure and Contrast.
So, there you have it – No Charter Boat hire,Scuba Lessons or wet feet!