Clown goby?

I think it's possible. I believe yellow are the smallest. No one will advise it though. Could be tough to maintain water quality and salinity. What are the dimensions of the tank?
 
Sump on a 1g tank... I doubt it unless it's a 8oz sump. I would just do a small shrimp or just some coral or macro algae
 
No. You cannot keep any saltwater fish in a 1 gallon tank. You could try a sexy shrimp or a squat lobster.
Are you aware that a 1 gallon tank will be very difficult to maintain properly? If possible, go with at least an 8 or 10 gallon, that will give you space enough for a little goby or two.
 
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