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Title: Was initially just curious... but it saved my 10-gallon tank...
Review: I had not seen one of these for many, many years... but I thought it would be useful as an emergency filter for a small tank. I actually had a 10-gallon fry tank that suddenly cycled a few weeks later, so I added this to a spare airpump with a mesh bag of "nitrate sponge" and some nylon fiber and a filter pad... It helped stabilize the tank and save the fry. If you are someone who prepares for an emergency with your smaller fish tanks, this might be a useful purchase...
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