I have an Alocasia Scalprum that I just got. It had been watered the day I got it so I was holding off watering and monitoring the soil on when to water next. I look at it today and I had yellow leaves that rotted off at the base and what looked like mold. I hadn’t watered it so I don’t think this is because of overwatering. I just don’t want it to harm the rest of the plant! Any advice on treating the mold and saving what I have left?