The closest I can find that may help you is If you translate brighwell aquatics iodine dip instructions to your concentration, (we may need @Randy Holmes-Farley for this) what I can find is its 14.4÷(ppm that 1ml would raise per gallon) so brightwells is a %12 solution which raises 1 gal by 34ppm per ml, so doing some math a %5 solution will raise one gallon by 13.3 ppm, so you'd add 14.4/13.3 or roughly 1.11 ml per gallon (@Randy Holmes-Farley is that right?)Nop, it's not marked as a coral dip.
This is the link --> https://www.naturalheroes.nl/produc...YV9k6TqYbmWNr4xXauqO6N4ohOmkfhJRoCaHIQAvD_BwE
"This Lugol's Iodine consists of 85% distilled water, 10% potassium iodide and 5% lodine"
Thanks so much for the help!