Our clownfish is down at the sand and wiggling it's tail in the sand. Like making a hole kicking up the sand ...so I was scrubbing the glass clean with a algae scrubber. And they where going nuts. So one of em came for my hand. It happens when we move or clean stuff but we norally use a net to hold them back but I didnt do it today. But then I looked at my arm. And I'm bleeding So what's that mean when they kick up sand and attack ppl ?