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I have a red neon goby (very small, too small I think)
yellow watchman goby, funny little digger
zebra bar goby, either on the very top of the tank, or hiding in the LR
I have a Yellow Prawn Gobie, Diamond Watchman Gobie and a Sleeper Banded Gobie. They each have their own personalities and it's fun to watch them interact with the rest of the tank. The Yellow Prawn is my favorite, he's the smallest but has a take no nonsense attitude. it's funny.