The best replacement for tunze is vortech.

The best alternatives to tunze are rated as following:
★★★★★  vortech
★★★  ecotech
★★★  hydor
★★  koralia
★★  jebao
★★  mp40
★★  sicce
★  hydor koralia
★  bubble magus
★  seio
★  eheim
  mp10
  deltec
  closed loop

Your alternative for tunze is not listed? Suggest!
Speaking about tunze, one probably shouldn't forget about apex.

Other search terms related to tunze and their ratings are:
★★★★★ apex
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Google Trends

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