Hi - we have a Violet Dragon Goby that is almost 4 years old. About 2 months ago he started to have a swollen right eye/right side of head. At that time the 20 gallon tank was not cleaned as frequently as it should have been. He is the only fish in this tank. My son first started to put more of the salt in his tank since he is a brackish fish and read that this could help. It didn't seem to do much so about a month ago he purchased a bottle of Artemiss 100% Natural Expellant for Bacterial Diseases at Petco. The bottle says Fresh Water, so not sure if that makes a difference or not. This is supposed to help with many diseases such as bulging eyes, bacterial dropsy, fungus, milky skin, fin/tail rot, ulcers, mouth rot, etc. When we started this (once a day) he seemed to be more social. He still had an appetite during this whole time. However, his eye doesn't seem to be getting any better. Does anybody know what this could be or what is the next treatment we can try? I tried to get a picture of him but he kept hiding in his log.