I had an order from Foster & Smith already and took the chance to try a new product. Used the premix for 50 gal Coral Vite from Kent and while many of my corals were ordinary in extension, the languishing pearl bubble and plate were delighted. The pearl bubble after dark extended aggressive sweepers, one nearly 4 inches long, and is puffed quite nicely. The plate is more puffed than I've yet seen it. It may not work wonders for every coral, but if a coral is short of nutrients, this stuff seems to do very well. I do note that my acros are well out tonight.