We use Reef Crystals and have never had a problem with it.. Salt is one of those topics everyone has a different opinion about.. I've tried Kent but did't like it at all then I found out from a fellow hobbiest/LF store manager that Kent just dosent have enough of "the good stuff" Reef Crystals has. So we went back to RC and never had a problem... I've thought about using some of the others mentioned but I don't want to "screw with the magic"!

purpleardvark said.."Most of the time low ph in a fish tank is cause by a lack of fresh air getting into your house/apt."
I just read an artical in the Aquarium Fish 2007 Annual by Sprung that said exactly that! And I quote....
"Closed homes of offices with a lot of people respiring carbon dioxide can produce lower pH levels." ("Are You Ready for a Reef? pg 100)So open that window gang!! lol