Am looking for advice on a calla lily hybrid that was given to me. Two of the leaves have pronounced yellow "stripes" radiating from each midrib (photos attached). The other leaves appear to have the normal speckling I see in photos online. My question: what is your opinion - is this a virus, a mineral deficiency, or something normal to calla lily hybrids? Not very familiar with calla lilies, so any help is appreciated. Thank you.