Can Oysters really be used as a Filter ?

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Nope.

A filter is there primarily to convert ammonia into nitrate. It's secondary function is to make the water clear.

Oysters would help if the issue was green water, but they don't last long in an aquarium because there's generally not enough food for them. Then they tend to die. Anything that they take in that's not food just gets spit back out. Not to mention anything that they do take in and eat just gets spit back into the water column as poo.
 
Oysters are also saltwater bivalves. Freshwater clams could help with water clarity but you need sufficient filtration and you'll end up having to feed them in a tank. I'm getting a bunch of clams for my pond to see if they help with water clarity before I buy a UV sterilizer.

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My filter is broken and i am trying to find a way to clean my tank while the new one comes in


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My filter is broken and i am trying to find a way to clean my tank while the new one comes in


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Sponge filter. You can make one for like $20 if you have to buy the air pump. Cheapest if you have the pump already.

http://www.planetinverts.com/DIY_sponge_filters.html

A note on this article: the automotive section at Wal-Mart has large sponges for cheap as well.
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