Bi color and watchman gobies get up to 2" so IMO they would be to big for a tank that small. I have and 8g biocube and I know nano fishes pretty good.
Here's my suggestion.
Tail Spot blenny which are very brave and out a lot
tangaroa goby
Yellow Rose Prawn goby/pistol shrimp combo way cool
Clown goby comes in many colors and needs a well established tank.
Orange Fire fish goby
My last suggestion issssssss A Flaming Prawn Goby!! One of the most beautiful fishes I have ever seen. Get no bigger then 1" buuuuuut they are on the pricey side at anywhere from 99.00 to 139.00 needless to say I am actually saving my change in order to get one.
I am keeping 4 of these gobies (not Flame no Clown) at the moment and love every one of them. They've been very easy to care for for me.
There's nothing like being a Reefer!
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