Algae scrubber

My boyfriend has built a new filtration system for our aquarium. It is called an algae scrubber.

An algae scrubber filters waste and toxins from the water. It moves the growth of the algae from the tank to a "screen" outside of the tank. The idea is that you create a better growing environment on the screen than occurs in the tank, so that the algae grows on the screen instead.

As you can see the algae are already starting to grow well on the screen!