Oh I was successful at keeping him. He was just evil. Just like the other people who owned one as well. 2 are also in the same line of business as you. So need to discredit the success either. There was plenty of room. Not over stocked. Plenty of enjoyable holes to call home. Did not have to out compete for food. In fact the person I bought mine from wouldn't sell me a fish if he felt like it wasn't a good fit for my tank, because his reputation is more important than a sale and he wouldn't sell a fish to person that would just end up killing the fish. You ever leave a customer that would pay you 60k a year to take care of tank? He did, because he didn't care for his fish.
Keeping our fish living and well is what most of us here do. Whether you get paid to do it or not. So that goes without saying..
If anything a suggestion of pairing one up with a pistol shrimp to keep their mind occupied would have been a better route. Since overtime they have evolved into that way of life. I do not have the experience to know that to credit it or discredit it, but people who have had a Randall's prawn goby said they didn't have a problem with theirs that was paired up and that maybe the underlying cause of the evil tendencies I and a few others experienced could be the reason why they were a horrible tankmate. And since I was talking about the fish and not it paired up. It is to be credited whether you say so or not.
If anything I would say you got lucky with yours if you actually owned one, but I don't believe it, because anyone can say what they want behind a screen to credit what they say or go take a picture of a client's fish.
Last word ;Stop