Hmm, I dunno, I feed 3 times a day & always thought that was a bit much based on other folks' feeding routine. I feed to keep my fish fat & healthy, not to keep nutrient levels up. Anyhow, I don't run any biopellets or HC GFO & haven't checked nutrient levels for a while, but tank's running fine. I don't sweat the bubble collapse on my skimmer. They always come back eventually & it pulls enough gunk. Clearly if bubble collapse is a concern & you feed that often, you'll need to modify your routine one way or another..... or live with it.
I'd say run fewer biopellets etc., feed less often & save money!
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