Thank you for your assistance. I moved him to a hospital tank yesterday and have been gradually dropping the temperature. The only med I had was Furan 2, so I added that to the tank. I will move him to another tank and follow the regiment you described. This morning there is still some discoloration but the lighter color is receeding and the borders around the discoloration are darker. He is still eating like a Hungry Horse and is very active. All my seahorses wrap their tails around my finger when I put my hand in the tank, so they are very easy to move. This seahorse is use to feeding from my hand. so no problems moving him. Thank you again, it is so hard to obtain good medical advise on seahorses.