I saw a Violet Goby at Petco recently and I had to have it. I went home and researched it, but there was little on the net I could find. I have found some sites say it is brackish water, but it was kept in freshwater at the store, and it seems fine in my tank at home. i do have some aquarium salt in my tank, but it is definitely not as concentrated as a brackish tank should be. He was being harassed by a few of my other fish, so i got a castle for him to hide in, he seems to be content. mostly nocturnal, appears to be a filter feeder, although there are mixed reviews on the internet as to what to feed it. Does anyone have any real experience with these?