Phalenopsis parishi new leaf with weird pitting

[sweta]

I have a phalenopsis parishi mature seedling that I got couple of months back. Its been doing well so far and has grown a new leaf but I see that new leaf has some weird pitting that its developed very recently. I'm attaching some pictures of it. I dont see any pests on it. I applied some organic fungicide but that doesnt seem to help. Anything I can do keep this seedling healthy? I water it once a week and its potted in mixture of orchiata bark and sphag moss. Temperatures right now are 80-85F in the afternoon.