Hi! So I’ve noticed my Calathea Ornata has some spots where it has discolouration and some kind of dried black liquid on it - looks like blood? The discolouration spots are mainly, if not entirely on the outside of the leaves. The discolouration is also almost in rings around the centre of the spot. I have no idea what it is but it doesn’t look like a good thing. Can anyone help me identify it and what I can do to help my plant?