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					Originally Posted by stephane
					
				 
				I read on farming and there a lot of coral farmer use only kalk for many reason 
			
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 Stephane, can you point us to that reading? I'd be interested in it. Reading a lot of Eric's stuff, he maintains that sleletal density is affected by using only kalk (incomplete calcification?). I haven't read enough though, so if you have some links, that would be great!