The best replacement for protozoa is bacteria.

The best alternatives to protozoa are rated as following:
★★★★★  bacteria
★★★★  algae
★★★  fungi
★★  protist
★★  metazoa
★  parasite
★  protozoa
★  protists
★  amoeba
★  parasites
★  protista
★  parasitic protozoa
  fungus
  microscopic invertebrates
  protozoan
  helminth
  sporozoa

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No companions for protozoa have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of protozoa in all years. Click on graph for more.
protozoa
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