Designed by Benjamin Graindorge and Duende Studio, this tank not only looks nice, but uses some simple ingenuity to accomplish the task of water filtration.

Here's how it works: nitrate-heavy water from your fish tank is pulled up into the garden, where it is passed over a layer of river sand, which uses bacteria to convert impurities into nitrates. The water is then passed over some plant life, which naturally absorbs the nitrates as nutrients. Then the purified water is thrown back down into the fish tank, where your gilled friends can swim at ease.

CoolHunting says there are plans for the Floating Garden to go into production in 2010, both in plastic and ceramic iterations. [Duende Studio via CoolHunting]

The details on the "My Chumby's Fish" design are pretty thin, but it appears that sensors monitor conditions inside the tank and report details back to you. Because it's Chumby heart utilizes a wireless connection, other fish lovers with this device can interact with your fish and feed it remotely via your own personal goldfish network. By "interact" I mean that the fish can see each other via webcam, you can talk to it via a microphone and use "shake and tap movements" to simulate vibration and air bubbles. Yeah, this is a bit over the top for something you will probably flush down in the toilet in a week—but then again, most design concepts are out there to begin with. [Yanko]

[Yanko Design]

If you have to ask about pricing, well, you know the deal. We'll pass on this one, we just don't think it is very secure—those two mermaids escaped without even smashing the glass. Ridiculous. Hit the link for some more fishy-fun images. [BornRich]