ID pls.

  • We are currently upgrading MFK. thanks! -neo
Looks like a cowfish
 
I googled cow fish and it only had the saltwater cow fish...
FYI i bought it for $3
 
It's a Marbled Goby. Cows have a distinct color separation.
 
its a marbled goby,had 2 of them..they grow to a good large size and are predatory.they will just sit and wait for a fish to pass and then just grab. unfortunately they became the prey in my tank.
 
MonsterFishKeepers.com