My LFS said kent wasn't that good, and when they had used it, they said there wasn't much of a big improvement. So far, when the Red Sea line came out, the switch, and they said that they have been getting a lot of improvements. I'm starting to use the Red Sea line also and I have seen improvements since I've switch from Kents. I use the Calcium, Calcium 3+ Stronium(sp?), Molybodemn (sp?), Iodine, and there trace elements. They might be a little costly, but they seem to work better then Kent. Anybody esle have good experenice with the Red Sea line?