My 650gallon tank was originally filtered by only a 90gallon wet dry filter, it was more than enough.
It will be hard to give you an accurate answer. As there are plenty of variables.
What is the total turn over, sump style, media, filter socks? Etc.
I ended up adding an FX5 just as additional mech and a bit of contingency. Started using filter socks, which I highly recommend you use to help with mechanical filtration.
I also added an auto water changer so my parameters are perfect across the board nitrates 0ppm.
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