Great tip #1, if you are planning on taking pictures first clean the glass inside and out. Great tip #2, if you see a once in a lifetime event happening rule #1 does not apply! Grab the camera and start shooting.
Macro mode will allow you to focus closely but gives you a very shallow depth of field. (Depth of field is how much of your tank from front glass to back is in focus.) This is great for corals but often not for fish.
I think that a tripod is a great tool and use mine all the time.
Play around using flash/no flash. Shooting at an angle or very close to the glass can help prevent the flash from glaring back at you.
I like to take pix of my tanks at night because light from the window makes reflections/glares on the aquarium during the day. I turn out the room lights too.
Take lots of images and throw away the bad ones! But, learn from the bad shots - why is it bad?
