Hello! Welcome to the world of houseplants. It's completely normal for a new ficus to drop some leaves when adjusting to a new environment, but the rapid yellowing, brown spots, and those tiny flying insects signal a few specific issues we can fix.
Light: Your ficus is in a corner with east/north light. Ficus trees crave bright, direct light. Move it right in front of a south, east, or west window with curtains open all day.
Watering: The fungus gnats (those small flies) breed in constantly wet soil. Their larvae feed on rotting roots. You're likely overwatering. Let the soil dry out completely between waterings. The pot should feel light when lifted. Empty the drainage tray within an hour of watering—use a turkey baster if needed.
Leaf damage: The jagged "cut" marks on a leaf or two are probably old nursery damage, not a current pest issue.
With more sun and much less water, your ficus should recover. The gnats will disappear once the soil stays dry. Good luck!
Ficus Leaf Curl: Insect Pests and Fertilizer Mishap
Ficus Leaf Spot (Cercospora): Fungus Management Indoors
Indoor Ficus Leaf Drop: Scale, Light Change, or Root Bound
Saving a Ficus Tree from Leaf Drop and Root Problems
Scale Infestation on Ficus benjamina: Treatment and Renovation Pruning
Ficus Tree Leaf Drop: Causes and Solutions
Dragon Tree (Dracaena marginata) Yellowing: Overwatering Fix
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