Now I'm living in Mexico and I could not find lugol's solution. I found tincture iodine, do you know how I can dose it... a drop in 100 gallons could be enough? Thanks
Tincture of Iodine is I2, alcohol, and water. The alcohol is used to keep the iodine dissolved into solution. Tincture of iodine is the least desirable method of adding iodine to your tank, it is acceptable for use as an iodine "dip".