Thanks for all the kind words.
As far as the pictures go, the secret is the digital. Not that the camera is so good, but you can just take shot after shot after shot and toss all the rejects. It would have taken me 12 or 15 rolls to get a 20 decent shots of these guys.
Shooting in a dark room seems to help as well -- I don't think they notice me lurking as much.
My former mother-in-law was a photographer and she showed me a technique once of panning with the subject. Doesn't work so well with the digital, but I've used it with the 35mm and it creates a nice effect. Keep the target dead center and move the camera with it, snapping in the middle of the sweep. The subject will stay in focus and the background will get a nice motion blur (instead of the other way around).
I was hoping to use the 35 the next time the gouramis try spawning, I haven't been able to get the digital to catch the colors in full breeding dress.