Excellent news! Let me know if I can help. The T3 is a nice versatile camera, you'll enjoy it for both the aquarium and everyday photos of the fam/vacations. Check out Photoshop Elements or Lightroom, or the cloud-based Lightroom for editing. They try to make those programs pretty user friendly and it will go a long way in processing the unique lighting of our aquariums.
Thanks for the tip. Can you point me in the right direction as far as where to look for a good deal for a macro lens? Looking for a Canon EF 100mm f/2.8L Macro IS USM lens, only about a grand.