I have tried add more plants in that corners of the aquarium I moved the decoration, I raised the water level to what I feel is too high( to soften waterfall effect) it's almost to the black line. I have sponge on the intake and I stuck one of the sponges inside the filter which help a tad bit. My betta can only swim in half the tank if he goes anywhere near the side the filter is on he gets washed back. This the filter:
You can get some aquarium sponge or foam and attach it to the outflow or put a prefilter sponge on the intake (this might be a good idea anyways to prevent him from getting sucked in, but it might not slow the flow much).
There's a thread in the habitats section (I think) on how to make a baffle out of a water bottle. I think this method sometimes doesn't work for people, though, and I would be concerned about sharp edges on the bottle. I don't have any HOB filters but I've put filter foam by the outflow of my internal filters and it worked.
Then get some very porous (large hole) aquarium filter sponge and use a silicon or rubber band to hold it in front of the outflow.
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