You bring up a good point; I should not get something just for the sake of getting something. I am going to use that concept for corals too.
There are many other basslets and dottybacks that you can get, it doesn't have to be the royal gramma. Now I didn't look at size or fish needs here. You will have to do some research to make sure they are a good fit. Just go to liveaquaria, click on marine fish, then down the left side of the page are groups of fish in alphabetical order. Most basslets and dottybacks stay small and will swim around. Below are a few I randomly grabbed and posted b/c their colors are great!
Sweet whip. I love my LFS (plural ) and i know what to use them for. I have one that focuses on corals and another on fish. My advice would be to go to the LFS and watch the gramma for a real long time. Like an hour. Then ask the owner to feed him. If he acts the way he should and eats then you should be golden . I also agrèe with what your LfS said about the last fish. Not a good call. Looking forward to seeing the new basslet in your tank.
Since we are on the topic of selecting fish from our LFS. .... the guy i go to for corals has an impeccable shop. He happens to also be a lover of lepord wrasse. He has over a dozen in the many "display " only tanks and they are beautiful.
He had agreed to try and catch a small one for me as he knows i am gonna be a repeat customer. His price is 2x what you would see else where but these buggers are known to have a 50/50 survival rate in aquariums. This stock has been in his tanks from 3 months to 5 years. So he is willing to guarantee their success.
Any hoo. You all know what i am adding next. And having a good reputable LFS is a wonderful thing to have in our hobby.
How about a Blenny?
Along similar lines, I love my Midas Blenny. He's so cute. The reason I didn't bring him up is he often hangs out in his chosen hole half sticking out (like an eel) and you wanted something active all over your tank. He does get out and go for swims, but more often hangs out.
Great fish, though. A lot of character.
My 4 year old neighbor kid thinks he's an eel.
View attachment 42735
This is mine in his hole.
View attachment 42736
http://www.liveaquaria.com/product/prod_display.cfm?c=15 23 83&pcatid=83&ref=4395&subref=AA&cmpid=PPC-G-B-4395&t=1