Hey. I have a monstera Thai constellation that’s doing great at the moment. However I’ve just noticed this brown spot on one of its leaves. It’s not dry and crispy at all just brown. I don’t stick to a strict water schedule only water when it’s 75% dry, plants in a good chunky mix and is under a grow light. Was watered 8 days ago last and is currently just finishing unfurling a new leaf. Any advice grateful.