I got that same tank.
Harvey seems quite happy with the way I baffled the filter.
I got a scothbrite scrubby pad and cut a strip long enough to go all the way across the front of the filter, and tall enough it could be folded in half and used one of my wife's hair bands to bind it to the filter.
This left a little gap where the water is supposed to come out, so I cut another strip of the pad just long enough to fit and slid it into the slot, behind the original pad.
This has almost completely stopped the current in the tank, there's a little motion from the overflow area of the filter, but he seems more curious about it than worried.