What should I do about my filter being too strong?

I don't really want to get another one but i will if i must. and i mean MUST. only option. so anyway, my filter is reasonably quiet but when it takes the water back out is CASCADES and it pushes any fish around that gets to close. So a soulution was i slightly loosened the intake tube that takes in the water and that lessenede the waterfall but it made a noise like when its drizzling outside and you're in a tent.. is this ok for me to do?