What type of "carpet"?
What do you consider reef safe?
I have S. Haddonis in each of my tanks -- if anything falls into them (( or comes in contact with them )) they are pretty much toast. However, mine stay put, so I don't worry about my corals and clams. My clean up crew has to be replaced from time to time as they get eaten, but nothing too major.
In the 12+ years of keeping Haddonis, I have only lost 3 fish to them.