clownfish stirring up sand!!

My tomatoe clown recently "stole" the carpet anemone from my little percula. Well about a week after he started hosting it, he also started kicking up sand around the anemone with his tail and back fins. it really gets annoying because i have to dust off the corals and LR after he does this, and the microfilter starts spazzing out too from the sand grains getting in the pump. any explanation to why he does this?
the tomatoe clown and the percula are both loners, so he can't be doing this because of spawning behavior..
but the funny thing is that the nem isnt even touching the sand so its pointless if hes trying to 'clean' it!

 

mine did that as well probably they were scratching but I did not see any harm effect and I had my clown for 1.5 years already

 

some clowns just do this, i think maroons are the worst for it. i have one that digs holes all the time.

 

Its a spawning behavior they will do it even if they are alone in the tank.. they never know when another good looking clown may be passing by hahahah

 

thats awesome because i might be getting a male for her soon haha