My scoly does that from time to time without me making any changes. I have never experienced any change in my corals when adding or changing the phosphate removal media. I've used both RowaPhos and Phosban.
The instructions on the Phosban insert does say that it can be dangerous to the tank inhabitants, if it is agitated too briskly sending it into the main tank. The first time I used it I didn't rinse it and a big brown plume went into my tank. It cleared in about an hour and nothing was affected.
