My phalaenopsis gigantea seedling has these tiny black dots and patches of darker green on its leaves. What is it?I am worried and it was really expensive
I don't think it's anything to worry about. Those are not signs of virus. The small black spots might be a little leaf spotting fungus but that's not a big deal. Clean the leaves off with some soap and water and just keep an eye on it.
I agree with Tucker on the fungal spots. The different colors of green on the leaves could be a calcium deficiency. Check your fertilizer to see if it has calcium in it.
If it is calcium, adding it to your fertilizer could even out the color on the leaves.