Clean the aquarium glass on the outside surface. Remove any streaks or dirt with a cloth so you have clear glass to photograph through. Also, take a look to see if there is any algae growing on the inside surface of the glass. If algae is present it would be advisable to give the inside surface a quick scrub (aquarium supply stored have brushes for this purpose, but if you own an aquarium you probably already know this).
Before photographing, turn off the air pump and/or filter so there are no bubbles circulating in the tank. Bubbles will obscure the subject since they tend to light up when the flash goes off. There is a second reason for turning off the pump, and that is to reduce the water circulation. The less motion there is in the tank when you take pictures, the easier your job will be; just make sure not to forget to turn the pump back on when you are finished. If you are shooting for a long time, you may want to turn the pump back on for a while to ensure there is enough oxygen for your fish.
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