| Hi, the phal with the dark stuff has some dehydration to the leaves, so watch the watering with it. It may be staying too dry, or it is from root damage, they sometimes do not respond well at first to a bark mix after sphag. The dark stuff, I am not sure what it is, but it looks like the leaves need cleaning, try some lemon juice (1/4 tsp.)to tepid water (1 1/2 cup)and some soft cloth or cotton balls to wipe and dry. You may have to go over some parts of the leaf more than once because of the water stains on them. See if the darker area wipes off that way, if it doesn't post another pic.
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