Addressable LED strip controller and WS2813 strips

The WS2813 led strips have four pins. Ground, 5/12 volts, and two data pins (I think it allows for a backup if an LED goes out?). Should the two data pins be bridged and connected to the DAT terminal on the controller? Can one pin go to DAT and the other to CLK? I've been having issues with part of my strip blinking and I'm wondering if it's because I have one of the data pins floating not connected to anything.