Hi there, my violet goby seems to be acting strangely lately, it is not eating and is getting thinner and thinner. His color also seems to be getting lighter not to a pale color but less dark than it use to be. Also his anal seems to be swollen? Is it possible that he got a parasite in him? He is currently in my quarantine tank and he has been in brackish water ever since i saved him from w**mart... He is my favorite among my other violet gobies so... i really don't want to lose him :|. He is getting weaker and weaker, is there anyway to help him or should i put him to sleep?