Currently, my 55gal has a sump with a skimmer in it. All is doing very well.

Im upgrading to a 75gal tank as so0n as I build the stand for it. Going to build a bigger sump and am starting to lean towards adding a refugium as well.

When I got my tank, the guy gave me a large HOB filter with 2 large bio-wheels in it.

Would adding the HOB filter be bad? Would it do anything to really help out?