I've had a sudden bloom of brown algea, and it's different any algae of i've gotten in the past: it's thinker, deeper brown, and there are air bubbles on top of the sand. water conditions: ph = 8.2, nitrates =15, and phosphates are 0 (although i don't know if i trust the phosphate test...is it likel that it's actually 0). I've attached a pic



