Recently I've been watering my Aglaonema Silver Bay a little too much (due to the scorching heat of summer in India). I've noticed that the stem has gotten pretty mushy and dark brownish. The plant cannot stand erect when I move it. It dangles. The tips of all the leaves have started browning too. The pups around the plant seem unaffected by the excessive watering. How can I save my plant? Please answer asap.