Before you start ringing up the SPCA about this apparent cruelty to fish, read on. The Fish n’ Flush aquarium is actually a two-piece aquarium toilet tank that would not have any trouble fitting into most toilets. This aquarium is encased around a transparent inner tank and is equipped with a 12-volt dual filter system that are child-friendly, a couple of 9″ plastic aquatic foliage, the fill valve, flush valve, flushing system, LED lighting, and even a built-in feeder door. You are required to add in your own gravel, water, of course fish (preferably tiny ones). At $450, this aquarium will definitely get visitors talking.