I got a pair back in December. They went into the tank and immediately began picking off the rocks. It was two months of trying every kind of prepared food before one day they went after live brine. After that they ate just about any kind of food I put into the tank.
They didn't bother my zoas or LPS but there was no question they were taking the tips off of some acros.
When my tank crashed at the beginning of the month, I was quite surprised that one of the Multi-bars survived.
Dave B