I am not sure how it will work on a 4 foot tank. I just added one to my 6 foot 180G and it is great. You do have a lot of control over the amount and size of wave. I have throttled the controls right back and I now have about a 3/4" wave. The wave structure runs from the bottom to the top of my overflow openings. Ask your LFS to demo the wavebox in a 4 foot tank before you buy it or what is their return policy if you can not make it work in your tank.
Tom R
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