I have a Pinguicula Planifolia that has suddenly developed an issue where the tips of its leaves are drying out. It still produces mucous elsewhere and has growth from the center of the plant. I grow this plant in a bowl with S. Psittacina and P. Lutea, those plants are healthy and have no such issues. I keep the soil really moist, and the grow lights should not be the issue... If not either of those, are there other possible causes?