:happyfish Well I'm no expert like the moderators, but I do know that you do need calcium and stronium and iodine at least. I use the powdered kind, because it lasts longer, and I use lugols iodine, because it lasts longer too. I don't like using the liquids because in my opinion they aren't dosed high enough, and aren't fresh, and also they can get expensive in the long run. The powdered kinds like sechem are more expensive up front, but WAY cheaper in the long run. I get a powdered calcium and carbinate mix and stronium and do essential elements, and use the lugols iodine. Your live rock and sand or crushed coral does keep your calcium on the chart but not like it would if you were adding addatives. This is SOOO important to do. I hope you listen to my advice, and start adding the chemicals again. -ali