Discontinue biopellets. Try and keep alkalinity as stable as possible. By the way your sps look the alk swings are playing a factor. Double check your dosing pump. Maybe slow down with the water changes also. I noticed the more I did water changes the worse it got. If your running Gfo stop it also. Let your system get a little dirty. And I would add the bottle of special blend. It did wonders in rebuilding the primary bacteria colony.
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