I’m not crazy about the particular models here, but I really like this idea, from user littlerob904 of Aquarium Advice, of using Lego MOCs to decorate your fishtank. I have visions of a detailed layout that covers most or all of the tank bottom featuring an Atlantis or a R’lyeh theme, with fish chosen to match.
Flickr user fotogra4er replaced the fluorescent tubes lighting his aquarium with LEDs. Which, of course, make way more light and way less heat for the same amount of energy. Then he upped the ante by cooling the LED lighting bank by circulating tank-water through it, which exploits what waste heat the LEDs do generate to warm the tank-water, and in turn saves power that would otherwise go to the tank heater.
