I am using them as directed. At first they did not seem to work at all, but over time they have lived up to what they advertised. I have had no issues with any corals, fish, softies etc etc. They do turn red after awhile. I placed them by a high flow area as directed.
I have a 180 gal DT, 90 gal refugium and a 75 gal sump. I run Rowa and carbon as well.
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