Maybe the biopellets consume too much potassium like in a zeo system. What salt are you using? Potassium level seems to vary a lot from one brand to the other. It might be one of the reason why some people experience degradation after a while.
I use the royal nature salt which have a 400 ppm potassium concentration which is a bit higher than NSW. Some brand have concentrations closer to 200! Other brands that have high potassium cocentration are aquavitro, brightwell and KV reef best I think.
I recentrly started to put SPS in my LPS dominated nano tank. I was planning to start the biopellets while keeping the heavy feeding of the tank in hope of keeping nice colors and growth. My nitrates are now at about 10 and phosphates at 0.15 with the use of a small refugium and GFO.
I was also thinking about trying mb7 and biofuel as an alternative. Is it really important to dose everyday for those? I'm not always at home!
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