Looking for Remedies to treat Ich

[RipCurl]

Hi,

I am wondering if anyone has any remedies for treating Ich. I recently got back from vacation and noticed 2 of my fish now have the parasite.

I did a 20% water change with RO water last week and now they seem to have it.

Would anyone know what caused it and how the fish be treated?

Thanks for your time.

RipCurl