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I'd take out at least half the duckweed and let the betta have more open water at the surface.

Also, please let us know:

What are the water params (in particular ammonia, nitrite and nitrate)?

What are the params of your tap water?

Did you do a water change or many ANY other changes to the tank in the 24 hours before this change in behavior?

Is the fish flashing (rubbing against the substrate or other objects in the tank?

Did you add the water that the duckweed came in, or treat the duckweed with anything for snails, etc. before adding it to the tank?
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