The best replacement for reef crystals is instant ocean.

The best alternatives to reef crystals are rated as following:
★★★★★  instant ocean
★★★★  coral pro
★★★  tropic marin
★★★  seachem reef salt
★★  red sea coral pro
★★  red sea pro
★  coralife
★  oceanic salt
★  h2ocean
★  red sea
  io
  seachem
  red sea salt

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