I am the new owner of some mushroom corals and torch coral, and my LFS
told me that I should be adding iodine to my water to help them. I've been adding purple up to my water since my tank finished cycling 4 monthes ago, and its kept the calcium levels up around 480 and allegedly it adds iodine to the system as well. i only have a 20 gallon tank, and i almost caused my tank to crash once already by adding micro-invert to feed some star polyps whose nutrient requirements i was misinformed about. i don't want to kill my tank with too much iodine but my mushroom is looking a little saggy right now (all levels are normal). Should I assume I'm good with the purple up, or should I add a little bit of iodine? Check my info for tank specs. Thanks.