Tropical Fish Keeping - Aquarium fish care and resources

Tropical Fish Keeping - Aquarium fish care and resources (http://www.tropicalfishkeeping.com/)
-   Beginner Freshwater Aquarium (http://www.tropicalfishkeeping.com/beginner-freshwater-aquarium/)
-   -   What does this thing do? (http://www.tropicalfishkeeping.com/beginner-freshwater-aquarium/what-does-thing-do-12071/)

The Trans Am Kid 02-20-2008 04:20 PM

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?

http://i81.photobucket.com/albums/j2...sh/p49323P.jpg

busteds13 02-20-2008 04:32 PM

it's an under gravel filter.


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