biocube 14 led

Hi I'm curious and have a new bio cube so I am wondering if cotton balls can also work as biological filtration.

Just starting a Biocube Jr. 14 Gallon. For now I have a few pictures of the tank just out of the box. It was a XMAS day present, which I can happily use for my saltwater enjoyment. This setup has one big hinge in the back and one in the front. Here are pictures of the lid, LEDs, and included...