Zayne Posted March 5, 2011 Report Share Posted March 5, 2011 do crushed oyster shells raise phosphates? Quote Link to comment Share on other sites More sharing options...
suphew Posted March 5, 2011 Report Share Posted March 5, 2011 Yes it's quite likely they will. You are better of using coral rubble if you want to harden your water. Quote Link to comment Share on other sites More sharing options...
myfishybuisness Posted March 5, 2011 Report Share Posted March 5, 2011 and it will raise the p.h Quote Link to comment Share on other sites More sharing options...
Ira Posted March 5, 2011 Report Share Posted March 5, 2011 and it will raise the p.h That's probably the whole point. I used crushed oyster shells in my tanks, have for years, no algae at all in any of them.(Well, in it now that I'm down to 1) I use coral now, but only because that's what I had convenient. Quote Link to comment Share on other sites More sharing options...
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