Looks like a good compatible "mix"...for a 150...
They may all be "small" and the tank looking mighty "empty" right about now, but it won't take long at all for these fish to put on some "size" and suddenly the tank will be looking mighty small...
Keep them well fed, in a healthy envrioment and plenty (but not too much) Rock to play in and call their "own"...
Also giving the Trigger something to play with and chew on (like whole Cockles in the shell) which will keep him occupied and less likely to turn his attention to the Lion...