I did some experimenting with high ISO photography tonight photographing Galius. As it was even darker than in my office I bumped it up to 3500 and stayed in Aperture Priority on 5.6. Most of my images were blurry and the ones that weren’t he wasn’t in a good position (he was flaring at a blue cup outside his tank and was almost constantly in motion). So I took the blurriest one with him in full profile to work with.
This was another choice: 