I found these today. From the Festival of Fishkeeping 2009.
Canon 50D, handheld, tank lighting, 17-70mm Sigma lens (all at 70mm, f/4.5). ISO 640 to 1600.
Canon 50D, handheld, tank lighting, 17-70mm Sigma lens (all at 70mm, f/4.5). ISO 640 to 1600.