I have a smaller LP in my mixed reef now. He's been fine so far. Prior experiences with this fish did not go so well though. One of the most beautiful, but riskiest of the dwarfs. Mine came out of a FOWLR that got closed down and nobody was interested in him. Was an absolute bear to get feeding initially (wouldn't eat a thing for three weeks), so I just thought *** and put him in the big display.
If a tank has an active population of other fish, and gets fed well, you may be OK. No guarantees of course. In a less populated or fed tank, LP can get 'bored' and be a problem.