Yeah, I let the calcium level drop to about 100ppm and it really started to decline but then so did the corals, snails, and eveything else. As soon as I brought the calcium back up it took off strong as ever. I can hardly keep my level above 300ppm due to all of the algae. I'm thinking a case of cold ones, a big bucket of saltwater, and a day with the scrub brush will slow it down dramatically.