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Royce I have never here anything about phosphates in IO. I have use IO for the last 5 years. It works very well for me.. Rick

I must be the old man here age 53 Rick

TY A couple of thoughts. First: the only additives corals NEED are calcium and something to maintain alkalinity. Anything else is a waste of money IMO. It is a myth in the hobby that iodine is :necessary: for soft corals, xenia, shrooms, etc. Try stopping the iodine and Strontium for a month. I...