I also do the sprayer thing. I have been fighting red slime, and some of the algae has died on my rocks, so i take them out one at a time (mostly so i can remember how i had them set in there.) and then spray them off with the sprayer, untill i get all of the crap off of it. So far, nothing has been hurt. My life on my rocks seem to still be alive, I have lots of feather dusters, and always see the occational bristle worm sticking out of hole.
Anyone else do this if so post your method. I have tried the power head method, but it was just too awkward and took a long time and i usually didn't get it all off.
Thanks
Curtis