The best replacement for xp3 is fluval 405.

The best alternatives to xp3 are rated as following:
★★★★★  fluval 405
★★★★★  accubond
★★★  2217
★★★  ballistic silvertip
★★  fluval 406
★★  eheim 2217
★★  barnes tsx
★★  eheim
★★  hornady sst
★★  xp4
★  marineland c360
★  samsung b2100
  rena xp4
  fluval 305
  xp2

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fluval 405
accubond