These purple markings appeared on the new growths of encyclia tampensis, could this be some sort of disease, virus or just some deficiency symptoms. Should I isolate this particular plant and plants that were kept together with it for the time being.
That looks like the purple pigmentation a lot of Cattleya alliance plants form when they get a lot of light. It isn't harmful, but the plant doesn't need that much light. But it's February, and that window might be too sunny in spring/summer unless trees leaf out and shade it. The sheer curtain mentioned in another post will help.
It's probably too bright for the fern.
__________________ May the bridges I've burned light my way.