Chris,
I know Below Sea level has a few Singnus Doliatus in and there is one that has been there for a few months. He looks to be in real good health as I take a look at him everytime Im there... which is about 3 times a month. I have considered them, but they get a little to large. If they don't get stressed they have that great yellow labyrinth pattern, though they tend to fade if they are not in good health or stressed.
-Erik