I noticed the F0 White Stripe PNG Maroon Clown pair acting oddly back on 2/16/2014.  Upon closer examination, I discovered this small nest…they’re second, spawned on the back of a large diameter PVC section.  Of course, disturbing the next allowed the Declevis Butterflyfish they live with to eat it….figures.  I’m thinking about removing all the PVC in the tank so I can force the pair to spawn on tiles.