Small white fluff on one of my horses. What is it?

[Reefhabit]

I noticed a small white fluffy mass on the skin of my yellow horse. I basted it and it flew right off and underneath is a small open wound or ulcer the size of a 1mm pebble. There are only sea horses in the tank and one fire goby so I don't know it was from fighting. I noticed that the tank got a little too warm so I gradually lowered temps. I treated the horse with some Marine Melafix. Hope it stops what ever it is.

 

[Peka]

If you see what looks like an ulcer on your horse, you need to remove it from the display tank and put it in a hospital tank.. slowly bring that water temp down to 68 degrees. You probably need to treat this horse with antibiotics. Can you post a picture of the "ulcer"? Is the horse eating? I would start looking for some adult brine to gutload with meds for the horse. If it looks like an open wound, I would treat for bacterial infection to be safe and use furan-2 for 10 days minimum and re-evaluate. Gutload the adult brine with the furan-2 and feed it to the horse. Make sure to do 50% water change on the tank daily and watch the ammonia levels.

 

[JasonC]

Any word on this little Seahorse ?