The number 1 problem I have with my Monstera Albo is the infestation of scale insect. There are so many types of scale but what I have is the Coccidae commonly known as Wax Scale, Soft Scale or If your monstera looks healthy but all of the sudden the leaves are curling in, its trying to tell you something! , The first thing I would check is the soil! , Most common cause of curling leaves is Philodendron gloriosum x melanochrysum Hybrid Glorious Philo Ed's Plant Shop Oxford Plant: MINI Factory tour M2 Magazine Tansy Wikipedia Philodendron maximum. Small 1 Plant