i dosent need regulating, i have the same filter on a 46 bowfront. with the outputacross the top its a little hard down draft but fish learn not to go in it it dosent harm anything you can turn the holes tward the glass if you want but its fine, maybe your tanks is a little more shallow but the out put hose is a little smaller than the input, not sure why, i'd guess that it is to keep the flow little higher to match the input, try it and see, if too much then put it vertical or at the bottom pointing up the water slows down the pressure and as it filters it is cut down a bit anyway,.. you should be fine
i also run a emoroer 400 on the same tank so the flow is fine just follow directions or pictures as mine i think was in chinese?