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  1. Equipment
    A Marineland 100 external filter came with my tank. It has a "bio wheel". It looks like a water wheel, made of corrogated paper product. It looks as if it is supposed to spin. However it does not, though it will spin freely if I pour some water on at. Is that normal?
  2. Equipment
    I have had the Marineland Penguin 350 filter on my 55-gallon tank for almost 6 months now, and the bio wheels are showing almost no signs of growth. The filter cartridges show a LOT of growth and my water parameters are practically always ideal. (Ammonia=0 Nitrite = 0) I realize it isnt really...
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