I use Hi-Cap (high capacity) GFO, aka HC GFO, in a TLF reactor
Whatever media and application/usage you decide on ...
Since you're just going to introduce this method, start small so you don't cause big issues in your tank with rapid removal of PO4
Start with say 25% of the recommended usage for the first couple weeks or month, then go up to 50% etc
If you use the recommended amount right off you will upset your corals and you'll not be happy with the results
