I have had these rocks in my tank for over 3 years now. I used to toothbrush my rock back when I first started. My rocks were always clean. Now I have a turf algae problem and my fowlers and chevron tang can only do so much. my nitrates stay about 20ppm and no matter how much I change the water and filters it stays the same. I was bored yesterday and decided to use a turkey baster and blast my rocks. man so much crap(detritus) shot out from the rocks. was nasty. clouded my tank pretty bad. anyway if I toothbrush my rock will this help get rid of my nitrates and turf algae? hate to sound like a newbie but was wondering if anyone toothbrushes their rock or if there is any ill effect? I have plenty of powerheads and 1 seaswirl. about to have 2 seaswirls soon. but somehow the crap just sits there. and yes I have a euro reef rs250 skimmer.