This desktop tank holds three jellyfish which “swim” around the tank (thanks to a gently contrived current). In the top of the tank are 6 bright LEDs, which let you set the mood. You can either have them blend softly from one color to the next, or stop on your favorite color.

Either way, the jellies are happy to frolic in their kaleidoscopic, quiet menace. And if one of your subordinates ever acts up, just remind him or her about the Blackbeard story and let them know there’s room in your jellyfish tank for a hand or two. Sometimes threats are all you need. Arrrgh.

If you are having any troubles getting your jellies to swim about properly, remember to add just a few drops of liquid dish soap to the water as per the instructions. It’s the part that makes the magic happen.