I got a pair of false percs the other day..
Well needless to say they are piglets..
So far they are tearing into mysis, zooplankton and red flake food.
Not the same kind of clown, but I assume it's the same omnivorous nature..
By far, of all the critters that have ended up in my tank so far (5 shrimp, a couple jawfish, couple clowns and the hermits/snails) the zooplankton seems to be the 'big hit'.
Comes in a jar (looks alot like a small jar of dijon mustard) and is a refrigerated thing after opening, made by Sweetwater and is one of those foods advised for new arrivals.
drfostersmith.com (liveaquaria.com) had it for 2 bucks a jar last week.
The mysis I offer them is the frozen cube kind from Hikari..
The flake is by Ocean nutrition.
I'm not sure what people advise to do for new arrivals.. I go with the feast or famine method.. I overfeed the tank on purpose when a new thing arrives, after it has been properly acclimated and in the tank for a couple hours.
So far, everything added has gotten in on the feast and the leftovers get taken care of by my greedy hermits/shrimp.
The 'feast' also seemed to get everyone comfy with each other... there isn't a grab for the food, since there is plenty...so no fighting.
Obviously not what you'd wanna do all the time, but so far it has worked for me and I seem to have happy/healthy specimens that get along (probably more luck then anything!).