The best replacement for biopellets is zeovit.

The best alternatives to biopellets are rated as following:
★★★★★  zeovit
★★★★★  vodka dosing
★★★★  refugium
★★★  gfo
★★★  phosban
★★  algae scrubber
★★  chaeto
★  rowaphos
★  nopox
★  bio pearls

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Speaking about biopellets, one probably shouldn't forget about gfo.

Other search terms related to biopellets and their ratings are:
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★★★★ refugium
★★★ zeovit
★ zeobak
★ reactor
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