newaqua Posted March 4, 2013 Report Share Posted March 4, 2013 Hey All. Quick question with regard to sand. Does anyone use crushed shells as sand? I have alot of Paua and Scallop shells here, and was thinking of using them as a substrate. Any ideas? Would they be too sharp for the fish? Would they alter the water chemistry too much? Quote Link to comment Share on other sites More sharing options...
alanmin4304 Posted March 4, 2013 Report Share Posted March 4, 2013 If the water is acid it will increase the water hardness and will also increase the pH. I use river sand as it is not sharp like crushed sand or shell Quote Link to comment Share on other sites More sharing options...
livingart Posted March 4, 2013 Report Share Posted March 4, 2013 if you can get it down to about 2 to 3 mm in size all good otherwise it will just be a detritus trap Quote Link to comment Share on other sites More sharing options...
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