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You might have to do a dunk.

What is that?

Thanks I wil have a look!!

Otherwise I can advise you to run dry-wet cycles. I never had gnats, but they love waterlogged and wet soil!

I Always do, let them dry out for at least 3/4 days. And almost never give to much, dont know how the basterds got here😂but they almost gone now.
The war on gnats is paying off haha

They're not the most destructive pests fortunately.