I have a yellow watchman goby. I have a good understanding about reef aquariums. I have a 30g tank and have add nothing to the tank, water is pristine condition. The goby is 2 years old and has been extremely healthy for 2 years. A few weeks ago, he started to spit out food and appears to have a sunken abdominal area. He has not passed any feces. He wants to eat and is very active at feeding time, yet spits out food. My question is can this be a parasite, old age or something yet to be scientifically discovered with this species. I have him in quarantine and using parzipro. Has anyone scene this condition with a long term fish that has been kept. Thoughts???