Pacific oysters, what makes them different from the pretty ones everyone buys is Pacific oysters work for their food, they filter particles in the water, which is most particles and help to certain point reduce nitrates and phosphates as well as act as biological filters filtering the water , they also Spawn from time to time and feed the coralsGood news: all are expanding. BAD NEWS: 2 look very smooth, 1 only slightly promising. Wondering if it's worth contacting Aquarium Depot and trying to get a refund( Special tips on sclero appreciated. Where do I get those Pacific Clams?? I already have a deresa and a maxima. What makes pacific clams so beneficial?