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I used Fritz RPM blue for a few years, didn’t notice the alk drop because I am dosing 2-part. Highly suggest that you start dosing 2-part if your alk fluctuates
I’ve had these nems for around 5 years and created an island for them on my 150G. I’ve been lucky that they have mostly stayed on the island. Once it gets crowded, some of them jumps off the rock but my flow pattern just keeps them around the same area never going near my other corals.