Q.Schefflera Has Brown Spots. Not Sticky. No Bugs. Otherwise Seems Healthy. What Is This? How Do I Treat It?
Leaves are smooth, shiny, and perky. Seeing new growth. Water it once a week. Has a grow light. Other plants around it don’t seem to be affected. Is it something to worry about?
Certified GKH Gardening Expert
I would make sure to keep an eye on that! It looks like the very beginning of a fungal/bacterial infection.
I can't really see if your container allow extra water to flow out, freely, or not. If it does, I would let the plant dry out down to about 3 or 4 inches before watering again, instead of watering on schedule. This will offer a more accurate reading as when to water. Overwatering is the leading cause of this type of infection.
Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/garden-how-to/info/applying-bactericide-to-plants.htm
https://www.gardeningknowhow.com/houseplants/schefflera/schefflera-plant-care.htm