wow, just finished a lot of reading. i currently use Oceanic and do have a bit of a brown algae problem, but i never blamed it on the salt. this thread has led me to think twice. as soon as i finish my current storage (unless i can sell it) i would try out another salt. I've used tropic marin in the past, but have had problems with testing it for phosphates (hard to tell how much exactly with salifert, but there was deffinitely a blue tint) so i decided to switch to another brand. Oceanic seemed to be the newest and the best at the time so i tried it. i prefer a more "advanced" formula than IO that is more targeted to reef tanks. Kent may seem like a good choice. Seachem also seems to be a reliable manufacturer in this hobby, yet i dont see many people using their salt (or seeing the salt even sold at many of the retailers). Anyone know why this would be so? I would be interested in comparing their salt as well as we did with the Kent.