After some research there is not much info on these guys. The limited info I have found so far says they can max out at 12" but usually dont go past 6-8" in captivity.
No reports of them going after inverts or small fish, just warnings from sites selling them(might just be for CYA). Being a planktivore doubt they would go after decent size shrimp or fish larger than 1/2"
Poor survival rates seem to be due to them not shipping well, or not eating on arrival but I dont see any actual info on how long anyone has kept one that was eating.
I also found one video of an adult in a 400g reef as well which is a good sign.
And lastly I just got home and both of them are out and about and eating pellets.
Im gonna poke around and see if I can dig up any more info, but I might just keep them and see what happens.