The best replacement for uv sterilizer is protein skimmer.

The best alternatives to uv sterilizer are rated as following:
★★★★★  protein skimmer
★★★  clarifier
★★  autoclave
★★  ozone
★★  diatom filter
★★  ozonizer
★  skimmer
★  ozone generator
  uv clarifier

Your alternative for uv sterilizer is not listed? Suggest!
Speaking about uv sterilizer, one probably shouldn't forget about powerhead.

Other search terms related to uv sterilizer and their ratings are:
★★★★★ powerhead
★★★ power head
★★ filter
You have in mind a companion for uv sterilizer and it is not yet here? Propose!



Google Trends

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uv sterilizer
protein skimmer
clarifier