My grapto propagations have red splotchy areas spreading up the stems. Is this fungal? It doesn't look right to me and looking for some help! I don't grow these normally and I am aware they need better light. Should I behead well above the affected areas?

The cobwebs are from normal spiders and there are no mites. The dark looking spots are not bugs, they are tiny patches of the leaves that have the same bright red colouration. Close up photos were taken with a 60x loupe.