Who Gives A Fish Forums

I'd also check for reflections. My betta was glass surfing like crazy until I covered the back and sides with black paper. Now he's way more chill.

How old is your fish? Older bettas tend to slow down a bit, might not be stress at all.

Ever tried adding Indian almond leaves? The tannins can help reduce stress and mimic their natural habitat. Worked wonders for my guy.