Thanks, all. The aquarium isn't finished yet...we're just finishing up the cabinet. If done right, they're not that much work. They need to be set up so they become a good natural biosphere and then they basically take care of themselves although you do need to do water changes. It's 215 gallons and both dogs like to sit in front of it and watch the fish from time to time. Guppy barks at them...I think he expects them to drop to the floor and play with him