biopellets are PHA bio-degradable polymers (hydroxyalkanoates) Id tend to doubt that the polymer in eggcrate has such properties ...polymers yes but I don't think they are biodegradable. Maybe the eggcrate cutoff flow and that was a factor but you'd have to have had a flow weakness initially for the eggcrate to create a worsening condition
I can confirm egg crate in white can cause algae issues. Happened to me in the past.
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