My main reason for getting out of this hobby was that all of a sudden my tank started to grow algea, hair algea to more specific. I had it running great for a few years all sps to softies were doing good. I tried cutting back on the hours of lighting to buying new bulbs even though my other bulbs were only 4months old. I replaced almost everything that wasn't naild down but it was a lost cause for me so I sold everything. Excepted one thing I didn't sell was my salt Tropic Marine. A friend of mine was just about to buy some so I gave him my salt it was brand new. I bought a 300gl. mix and used about half of it. Now he has been battling hair algea for months now and the only thing he has done different is adding the salt I gave him. Ever since he let me know about this, it kind of made sense to me b/c my problem started around the same time. The more I used it the worse the problem got. At the time figured that it couldn't be the salt it was brand new and my water was always at 0 DI and the tank was always crystal clear. Could this really have been my problem.