BIO-WHEEL FOR A 20
- Thread starter Mike fail
- Start date
A penguin 100, 150, or 200 would work fine. I would personally go with the 200. I had one on my 29, and it could have used more filtration. Its always good to get a larger filter than you think you need. The only other biowheel filter that is suitable is a Emperor 280, but they may be a bit more than you need. An emperor 400 or Penguin 350 would be unnecessary, and take up a ton of space on the back of the tank.