This one if for you divers, fisherfolk, and just plain fish lovers. Especially those with kids. Turn your toilet into an educational adventure every time your kids visit the bathroom. Especially the little ones you're trying to potty train. "Little Bobby, let's go look at the fishies." The Fish n' Flush is a working toilet AND an aquarium:

Fish-n-Flush™ is a patented two-piece aquarium toilet tank, designed by AquaOne Technologies, Inc., an innovator of water management systems.

Fish ‘n Flush fits most two-piece toilets and turns the bathroom into the center of attention with its unique design of an aquarium that wraps itself around a clear inner tank.

The product, developed in-house by AquaOne designers, was a hit at the recent Kitchen and Bath Show, open to people in the plumbing and home improvement trade, and appeared on CBS' The Early Show, which featured new products “for kitchens and bathrooms of tomorrow.”