With that canister, don't waste your money on the nitrate absorbers. The only thing that has worked for me lowering or getting rid of the nitrates(aside from water changes. lower bioload and good maintenance) is azNO3 and that's a liquid. You can get it online.
As for a phosphate absorber, I've had great success with PhosGuard by SeaChem. Rowaphos or Phosban will not perform for you in that filter because those two materials require a lower flow of around 80/90 gph
I'd run carbon, PhosGuard and Purigen since that model had 3 containers or carbon, PhosGuard and Sea Gel .
You may also want to consider putting some macro algae and plants in the tank also like Halimeda, turtle grass and some shaving brush ......it gives the tank a nice natural look too........or you might consider converting an HOB
filter into a mini "Fuge" with Cheato in it. There's a thread on RC on how to do that.
The packaged nitrate absorbers really don't work.........as a matter of fact they create more nitrate because they harbor bacteria which cycles creating more nitrate .
If I can be of any more help, let me know. GOOD LUCK!!