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One of my bettas is in a 4 gallon filtered tank, bare bottom, one anubias nana, some wisteria floating and a part of an indian almond leaf. The walls are quite literally covered with planaria

It's worse in some other parts but I couldn't get a clear shot.
I know planaria is a sign of overfeeding and a lot of decaying matter in the tank, but as the tank is bare bottomed I can see there's no decaying matter other than bits of my betta's poop, and I only feed my betta enough to get his belly rounded, and he always eats all of it. I change the water every 3 days, around 30%. So idk why there are so many.... and how can I get rid of them without doing a 100% water change and scrubbing everything?

It's worse in some other parts but I couldn't get a clear shot.
I know planaria is a sign of overfeeding and a lot of decaying matter in the tank, but as the tank is bare bottomed I can see there's no decaying matter other than bits of my betta's poop, and I only feed my betta enough to get his belly rounded, and he always eats all of it. I change the water every 3 days, around 30%. So idk why there are so many.... and how can I get rid of them without doing a 100% water change and scrubbing everything?