Odd bicolor habit

[Tab28]

Well i need to catch my bicolor angel. It took me awhile to see which fish was picking at palys. After i saw it pick at a new trachy. It has to be gone. The odd behavior is it only seems to pick at new corals, only softies and LPS. It only picked at the new palys not touching ones i had before he was added. All palys and zoas are grouped together like a garden. Even the trachy. Older trachys nothing new one fair game. Is this normal?

 

[eatbreakfast]

I have seen a few fish show a preference for new corals, a few dwarf angels did it, as well as a blue spot toby. They would pick at new corals and leave ones that had been in the tank prior alone.