Definatley need a tripod....cause you should have the flash off which means longer light exposure. For that you have to have the camera extremley steady..hence the tripod. Also use the macro setting. Also make sure no other lights are on in the room and try and take pics at night to avoid any reflection off the glass
Heres one i took of one of my Rams with such a method...turned out pretty well.
Turn off the flash if you are taking a picture from more than a foot or so away. If you don't you'll get to much reflection off the glass. If you are doing close ups of fish, keep the flash on since the camera will be right next to the glass.
It helps to have a camera that has a decent shutter speed. My digital camera takes forever to take a picture, its near impossible to get my fish to pose long enough. :thud:
One big tip I've found has to do with flashes. I use mine, but I make sure to be at an angle from the glass, to keep the reflection low. At 45 degrees the flash goes right through the glass. I've had some good luck with my new camera that way, but silver fish are nearly impossible to take pics of with a flash.
Some pics with my new camera.
I've got a Canon A70, I got it due to some other people I talk to online having good luck with it, and so far I'm quite happy.
Out of over 1,500 pics I've probably gotten 100-200 that I like, and not nearly as many I would consider printable. So, keep trying.
Some I got with my old crappy camera. The only good thing about it was a killer zoom. 300x it was a camcorder with a less then 1.2 megapixel digi cam in it.
Eventually I'll borrow a tripod and see what I can do without the flash.