The first couple of days that Fluffy was in the Fluval View, he was kind of pathetic.
Oh poor me. Woe. I can't swim. Flail & flounder. etc. This happened whenever he roamed away from the pointy ends at all.
I, of course, panicked, as any clear-headed, right-thinking new betta owner would.
I rigged up the foam baffle for the output spouts (which worked great!) and added a piece of foam to the inside of the filter housing to baffle the intake (which did nada!). In the meantime (2-3 days by the time I figured it all out and obtained supplies), Fluffy had muscled up a bit and was handling the water movement a bit better.
I think that he probably would have adjusted to those output spouts just fine if I'd let it be, especially because I kept the water level quite high so there wasn't much of a waterfall effect. I found him snoozing comfortably next to the intake vents a few times -- scared the crap out of me the first time because I thought he had been suctioned onto it and couldn't escape.
If you thread stalk my past posts, you'll find some explanation about and photos of how I baffled the filter.