I bought an elephat ear bulb this year at Wal-Mart. It is growing fine. I have been noticeing brown spots on it and that kind of ruins the whole look. One leaf is brown all the way around the edge. There is a new leaf ready to uncurl and it already has a few brown spots on it. I noticed fruit flies or nats in the pot on top. I have been spraying it every now and then. Any suggestions?