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Originally Posted by Alan Joseph
That branch rock looks really cool, would like to get a couple of pieces and see if its really that good...
Not as porous as the regular rock - would it be considered good for biological filtration still?? Isn't it the porosity that makes it useful? All the branch I've seen and have is very solid, compared to Fiji or Tonga.
Alan
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As far as I know it is the porosity that gives a surface for the bacteria to colonise. The more porosity, the more surface area. Hence Fiji is better.