The larger of my pair of clownfish has been digging in the front right corner of the tank while the smaller is at the back of the tank. Maybe they are getting ready to spawn? To the left of the hole, it will swim very close to the sand and then takes off towards the corner as fast as it can. So now there is a strip of sand that looks like a trough and a nice area dugout in the corner. Anyone else see this behavior as far as the sprinting? I'll try to get some pics of the holes later tonight.