Clowns

Hi all. I've dreamed for many years of having a reef tank. It's finally happening, and I was beyond thrilled to get my first inhabitants yesterday: four clowns. They are beautiful and fun to watch.

Here's my question: they seem to spend most of their time in a small clot in one specific corner of the tank. It's a big tank, a Red Sea 650, and I'm just wondering: do clowns normally huddle in a corner rather than roam or hang out in the LR?

Thanks!