I've had this plant for about 6 years now, and this bottom leaf, which I'm assuming is probably the oldest, has started drying up from the tip of the leaf. Is there a way to safely remove this leaf without exposing the plant to possible invasion through the wound of removal? I do have fungus gnats (currently trying to exterminate them with traps to disrupt the breeding cycle), and I'm not sure about any other critters. I would just let the leaf dry up on its own, but I worry about it drying the rest of the plant, or the plant expending too much energy on this dying leaf instead of growing more.
All in all: should I remove this leaf and, if yes, how do I do it safely without risk to the plant?