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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.
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