Convert my canister filter to gfo/carbon reactor?

[Sgt Jonny Cat]

After a lot of reading on this forum, and a lot of input from you guys, I think the best thing to do with my Fluval 406 canister filter is to convert it to a carbon/GFO reactor to expel nutrients. (if you have read my threads I am having cyano issues)Has anyone done this? And if so, how do I go about adding the media. I assume GFO on the bottom, carbon on top? (there are 4 chambers) and then some sort of sponge to catch any particles?

Thanks again everyone...

55 gallon FOWLR but plan on growing corals soon, live rock live sand, HOB Eshopps skimmer 1 koralia 850 gph power head, and am waiting on a Jebao wp25.