I have some pellets that look alot like brs ROX carbon.. I am running that exact carbon in my system now.. I have diatoms un this new 65 gallon reef. That's 6 months old. So I got a pencil urchin and a fee snails.. I came home from work and checked the tank like I always do and I noticed these black pellets all over the sand bed.. my first thought was my bag of carbon broke in my sump.. my heart sunk to my feet because I just got a very expensive gem tang I don't want harmed in any way. So I checked the media bag and it's fine.. what could it be.. please help