Tumbling of my pellet has never being a issue, is has alway been gentle,in fact I haven't adjusted my reactor flow in never 3 months since I last added pellets.
As for nitrate/phos testing my test kits show 0ppm for both, but I'm highly suspicious as byopsis is coming back, hair algea, cyano and calerpa have reared the heads, prior to bio pellets all of them were absent and never a problem.
My lighting is strong and the bulbs are only 5 months old.
Skimming is strong and I empty/clean the collection cup every 2-3 days.
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