I also have the wet/dry pro 75 filter. It is my experience that when you have at least 1.5 lbs of LR
per gallon (that would be about 70 lbs for your tank) that you do not need ANY bio balls in the wet/dry pro. When your next shipment of LR
comes in, that will give you 56 lbs of LR
, right? You'll need about another 15 or so.
I think you could go with the 56lbs of LR
, and keep say about 25% of the bioballs in the wet/dry pro - but I'm speculating. Anyone have thoughts on this idea?
If you do go with 1.5 lbs per gallon, and you take the bio balls out, it simply becomes a sump. You have the pro series, which means you have the protien skimmer already in there, right?
Your 70 lbs of LR
should be enough (when combined with the proper sand bed) to act as your filtering agent.
Ask around for the proper sand bed for your setup. I think 4 inches of Live Sand would be the way to go, but I think others have much more experience in this matter.
Keep us posted