So I've had a Clarkii Clownfish for about two weeks now and since I put him in I've been noticing my sand has been moving around quit a bit. I figured it was the new clownfish and tonight I finally caught him in the act. It's real bizarre, he'll get real close to the sand, open his mouth real large and then latch on to a near piece of live rock. Then he'll kick his tail real fast and stir up the surrounding sand. He only does it for about two seconds. Anyone seen anything like this before? I found it real strange. I have him in a 30 gallon with a Valentini Puffer and a Bicolor Psuedochromis, FWIW.