oyster shells clean water?

[lardylarry]

A guy told me that oyster shells are really good for keeping aquarium water clean. A quick search on the internet said oyster shells have a lot of anaerobic and aerobic microbes that feed on dirty water, but has anybody ever tried it?

 

[moxxommox]

Are you sure it wasn’t freshwater mussels? just invest in matrix rock.

 

[guppy]

Dried Oyster shells are very porous and provides addittional substrate for bacterial growth but also raise the pH over time.

 

[RadleyMiller]

Dried Oyster shells are very porous and provides addittional substrate for bacterial growth but also raise the pH over time.

They would be a lot better used for pH buffering than biomedia.

Besides they will dissolve over time so Matrix would be a lot better than oyster shells.