That is a definite possibility that is on my list.ryanr said:I'll second the GFO.
I used Deltec's RowaPhos in a reactor and had great results. There's also a lot of endorsements for the Bulk Reef Supply GFO.
Other nutrient removal/management options would include Carbon Dosing; bio-pellets, VSV, Red Sea's NO3-PO4-X. Though if you want to go the carbon dosing route, make sure you do your research, and fully understand how it works. Carbon dosing can be a catastrophe if not done carefully. You'll also need a very efficient skimmer.
Ultimately, I ended up running bio-pellets AND RowaPhos together. My PO4 stayed at or below 0.02