Hello, I recently planted several plumeria cuttings. The soil has 1/3 miracle grow potting mix, 1/3 sand and 1/3 perlite. I also added BR-61 Fertilizer 9-58-8. This morning I noticed the worm shown in the in the picture below in one of the pots. Is this a worm indeed? Is this harmful to the plant? Is there a treatment to get rid of it?