Just like us, corals and solid inversions need vitamins. They can't find them everywhere, so they have to get them out of the water. Good reef salt contains microvitamins, but if you have a lot of livestock some elements can be depleted. I've found that taking a vitamin supplement like this pays off. I don't use it as often as the bottle recommends. It's hard to say what amount is right for your aquarium; need experience and intuition. I used to just throw away a cap or two when I thought about it. I'm trying to be a little more scientific. I started checking the iodine content. I've found my iodine to be depleted fairly quickly after a water change (with new salt fortified with Id). As expected, the speed differs from my calcium or magnesium levels. Using iodine as an indicator for vitamins in general, I'm trying to determine how much of this substance I should be using. But I definitely recommend it for healthy corals and sessile inversions!
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