I'm in the why worry camp, although I don't have a lot of valuable sps either. I haven't been testing for anything for quite some time, something I did more regularly when I was new in the hobby & so was my tank. With the passing years, my best test is observing how the livestock & coral I have are doing on a daily basis. Haven't had a major crash, some critters including coral have died, but in my case, chasing numbers has never really solved anything in that regard. Every once in a while I will throw some baked baking soda, epsom salt or calcium into my top off container.
I understand testing for Potassium is the latest gig?
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