I bought this for my 55 gallon tank that has a dozen comets. The aquarium is green with algae and the algal acid doesn't seem to help much. Tried this 5w light and wow! It took about a week for the pea soup to become crystal clear, but it turned out exactly as it should. I changed the filter daily (I just used pieces of cloth and hand washed them) to remove dead algae. I highly recommend this wonderful little UV sterilizer.
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