Ive had cbs's in my tanks for years with no problems ever. I do spot feed them occasionally, because i have read-i think even on this site for the description-that if they are hungry, they will rip open an anemone.
So occasionally, while im spot feeding my starfishies, i give hm a chunk of the frozen food as well.
There is always a fine line between spot feeding, however, and letting a creature find its own food like in nature. Some people spot feed too much, and the creature begins relying on this instead of seeking out its own food-and in the case of the cbs which is a scavenger more or less.
I learned this years ago, when I used to always spot feed my cbs's...little suckers would run to the front of the tank anytime they saw me with my grabbers even if i was using them to adjust something! Otherwise, he would hang upside down in his little "cave" all day!