Few things
First if possible find him a new tank buddy locally -best scenario
Might want to try and rehome him or find another goby they may hit it off
I've heard placing a small mirror near where he frequents most may help but I am only going by third hand information on this one
Lastly wait it out see if he recovers or not
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 My aquarium is nothing but a smorgasbord for my cats.....
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