Sand Test

[ole kekkonen]

Her er et rigtig eksperiment udfört af rob toonen der viser at sand reducerer näring istedet for akkumulere näring

http://www.advancedaquarist.com/2005/6/aafeature" onclick="window.open(this.href);return false;

Del2

http://www.advancedaquarist.com/2005/7/aafeature" onclick="window.open(this.href);return false;