The best replacement for goby is blenny.

The best alternatives to goby are rated as following:
★★★★★  blenny
★★  sculpin
★  cleaner shrimp
★  cleaner wrasse
  jawfish

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

Other search terms related to goby and their ratings are:
★★★★★ blenny
★★★★ pistol shrimp
★ tiger pistol shrimp
You have in mind a companion for goby and it is not yet here? Propose!



Google Trends

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goby
blenny
sculpin