Thanks, Bill, for your compliment. 🙂 As for the photo methods – the fish actively swim about the entire aquarium all the time, so it is a matter of waiting until they move the the front of the aquarium and then I can snap a few photos before they get shy and move off. I have read that sumatranus are very shy, and these are sensitive to any movement in front of the aquarium, but they really do not hide all the time by any stretch. So, kind of lucky that way. The tank is quiet (no filter), not too brightly lit and, I guess, arranged so that the fishes feel somewhat safe to move about.
My camera is a mid-range Nikon P-510, nothing special at all. It just has a fairly good macro capability and enough flexibility in manual adjustments to work for my limited photo skills. I would recommend it to any aquarist for fish photography who does not expect top quality results and does not want to spend top $$ for equipment. Maybe one of these days I’ll move up, but for now this one will do. I’ll post more photos as I can. In fact a few more just now.