My poor hi fin goby seems stressed. He is gaping his mouth and swimming in one spot. He is very unreactive. He appears to hove two minor scratches on his side, but It does not seem to be infected. Could it be of old age? He also has a bulge in his belly, and I fed him yesterday. Could he have an internaly infection or impaction? Since I cannot provide a pic right now, just imagine a normal-looking hi fin goby with a gaping mouth and bulging belly. It is not because of water, my zoas, LPS, green clown goby, cardinal and tiger shrimp are perfectly fine.

Please help!

How old is it?

What are you feeding?

How long have you had the goby? They can live a long time.
A pic would sure help others to help you as well as parameters, and what you are feeding your fish.
Hope he gets better.

I'm sure paramaters are fine. If the more sensitive pistol still feels like digging, the water fine. I've had the goby for about 5 months now. He's sleeping right now so I can't get a pic. Hopefully he'll get a good nights rest.

I feed my fish and shrimp PE mysis, every 3 days or so.

My goby died .
I guess he was old, you never know how old a wild-caught fish is.
Now my shrimp is lonely!