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Whoa....too much, it's 1 drop per 50 gallons. Read the side of the bottle.I use the Tropic Marin Iodine. Once a day. 1 drop per 20 gallons.
I don't, and would never recommend people dose iodine.
1. It is fatal to different animals, and we don't know what those levels are even if you could get an accurate test.
2. Because the iodine is used up from the water column almost immediately, there is no way to accurately test or measure for it. It's a lot like phosphates, when you hear about those people with algae in their tank but their test kits all show 0. We know they have phospates because you have to have it for algae to grow, but since it's used up by the alae so fast there really isn't an accurate way to test.