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- - What does this thing do? (http://www.tropicalfishkeeping.com/beginner-freshwater-aquarium/what-does-thing-do-12071/)
What does this thing do?
I have one of these on my 45 gallon tank. Everything in that tank is like 30 years old, but here is a picture of a newer version. So what is it?
it's an under gravel filter.
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