if you use live rock in your sump and have the rock submerged in water thats fine.
Wet/Dry's usually get a bum wrap because of the bio balls and how the water trickles over them creates an abundance of nitrates. If you go reef you want to keep your nitrate levels down. Thus bioballs are kind of a reefers enemey.
__________________ Remember dont tap the glass, your fish will think you're an idiot-Anonymous mother