I was told there is no medication that will treat lymphocystis virus. Several of my fish have had lymphocystis. It does not really seam to bother/affect my fish at all and it generally goes away in a couple of days. Only one of my fish has shown signs of lymphocystis twice, the rest have only had it once. I would feed a little extra and try and keep maintenance in the tank at a minimal. Good luck, if it really is lymphocystis virus I would not be to concerned.