I have had my gobi dragon 'peekaboo' for about two years. he is in a brackish tank that started as freshwater and I gradually bumped it up to it's current salinity of 1.012 over the course of a few months and it has been near that salinity for over a year. He is in a 47gal tank with one archer, one catfish thing, and a night gobi a sand substrate and a nice log that he has made into a little cave. The problem is that he has become dangerously thin! Really sad to look at thin! 
I feed him blood worms which he used to happily gulp up but it seems he is less actively eating. I see his gills expanding a lot after i put them in the tank so I assume he's getting some (or at least hope). He has almost no color and is bleached out to a pale cream except for on his tail. he also has a dark spot on his side that looks suspicious. I've tried mysis shrip and in the past gave him algae wafers (which he didn't take much intrest in). Is he doomed? Am I doing something wrong? Is the salinity to high or low? I've seen happy gobis in marine so I'm thinking too low? please some educated advice.
I feed him blood worms which he used to happily gulp up but it seems he is less actively eating. I see his gills expanding a lot after i put them in the tank so I assume he's getting some (or at least hope). He has almost no color and is bleached out to a pale cream except for on his tail. he also has a dark spot on his side that looks suspicious. I've tried mysis shrip and in the past gave him algae wafers (which he didn't take much intrest in). Is he doomed? Am I doing something wrong? Is the salinity to high or low? I've seen happy gobis in marine so I'm thinking too low? please some educated advice.
