Hi! I’m a little concerned for my Philodendron Birkin/ White veins, they have yellow leaves at the base. Just wondering if it’s from overwatering, too much light, etc. I really don’t want to lose this plant, I really do love it. The leaves at the top are healthy, but it’s just the bottom ones (I think they’re new little leaves) Should I also cut them off? I’m getting fertiliser too just in case it’s nutrient deficiency. The leaves seem stiff / soft instead of crunchy if that info means anything Thanks! (I have a grow light and use boiled water or sit my water out for 24hrs.)