I started using biopellets after 1.5 years of running my tank and within a month my sand, rocks and glass were covered in cyano. Output was aimed directly at the skimmer, but maybe I had them tumbling too fast in the reactor. It's kind of hard to tell what 'too fast' is without physically watching the reactor of someone who is using them successfully.
I probably would have stuck it out and tried tweaking things if I hadn't needed to break down my tank, but it's food for thought for the next build.
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