Fungal Infection on Leaves

[Bloomer001]

A few weeks ago I added a lot of sphagnum moss to top of pot and began a lot of watering. The bottom leaves developed a fungal infection, which is spreading rapidly. Yellow circles are present on the leaves. They started on the underside of leaves and are now showing on top side. I believe it may be "microfungal" infection. What is the best way to treat?

Should I cut off infected leaves or can they be saved with a fungicide? Does hydrogen peroxide work? Has anyone treated with Banrot plus Aliette, then Cleary's plus Subdue, then Banrot plus again?

[Roberta]

The yellow circles look more to me like pest damage - like scale. The purple color is just from light - maybe near the upper edge of what the plant wants (Phals are low-light plants)

[estación seca]

Those don't look that bad. It may just be an old leaf near the end of its life. Continue normal care. As always with Phals., the warmer the better.