Hino,

Seriously, the only time you need to be concerned is when you are fragging them. Ypu've seen my tanks. They are both covered with zoos and palys. I've handled them hundreds of times. If you are concerned, just wear safety glasses and gloves when and if you are fragging them. The gloves are a good idea anytime you are handling corals, both for your own protection as well as the coral's. There are some nasty, potentially pathogenic, bacteria that grow on corals.