adding fish to reef tank

Hi all, I just added a pair of Percula clowns (post-QT) to my recently cycled reef tank. What would you add next, and why? Tank has a ~68 gallon display with lots of dry rock and a 2" sand substrate, if that influences your choice.

We had a shipment of more captive bred fish from Biota come in. Here’s a quick view of the ones that came in that we added to the reef tank: Link’s Goby: List that just came in: - Palau Mandarin fish (PAIR) - Marine Betta (PAIR) - Blue Streak Cleaner Wrasse x1 - Yellow Watchman Goby x1 -...