Only thing I've ever checked is the salinity for many years. No issues, but wouldn't you know it, I decided to buy a batch of IO in the cardboard box instead of a bucket a few months ago and after a couple water changes, my tank started crashing..... in recovery mode now with a couple water changes using a new bucket. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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