This is a cool product. I use it as decoration but as a tool to inspect my fish. Able to look at who's fins are getting nipped and any other ailments.

Product Description
Get a fish-eye view of the world inside your aquarium! The Reef Porthole is a magnifying lens that attaches to your tank and can be positioned in any place you desire to give you a 2x magnified look at your fish...up close and personal. One side of the Porthole goes in your tank and the other side is positioned on the outside, directly across from each other, and they are held in position with magnets. This allows you to move the Porthole to different places on your tank to get the best views possible!

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Product Features:

Adds to Any Tank
Make your Tank Unique

Just thought I'd let you know I ordered one today

I saw one at PETCO awhile back. I wanted it but my mom wouldn't get it for me. I wish I would have. I have to save up my allowance.