Does it kill coraline by any chance? My 10 gallon has several different varieties that I placed in the tank intentionally. I used a product by ARCReef and it's worked amazingly.I think I treated for 3 months to make sure it was gone. On the plus side, it really does clean the aquarium.
 
	 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		