I have not had any experiences with the Goby and firefish but I have had other Gobies do the same thing, and especially with a firefish they are a very shy fish and timid, they will eventually sort it out and one will find another spot. They yellow Goby may just be there for protection being in a new tank and all, but the firefish can be alittle aggressive when it comes to they own spaces but just monitor them and if it continues then look into something but let them be for a little bit.
Kris
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