My male scooter will come to the glass and put on a little "show", opening his mouth and twitching/spreading his fins at me as if to say "get away from my tank, lady!" Or maybe he is hitting on me!
You can't really predict when he will do it, your hand or face or the baster close to the glass has no bearing. But the only sure thing is if I get the camera, he stops and is back to his pod hunting like nothing ever happened.
I was taking some other pictures and mostly ignoring him when he decided to put on the act. I didn't have too much time to think about camera settings, just tried to get focus as quickly as possible. Here's the one shot I got!
Camera is a Canon XTI, was in shutter priority mode 1/100sec, f5.6, ISO800, manual focus w/kit 18-55 lens. I did adjust levels in post processing because it was dark at that shutter speed. It still looks dark on my desktop monitor, but too light on my laptop. I guess I have some monitor calibrating to do. lol