I would add more to it. I have a 220 with an FX5 and two Emperor 400 HOB. I am thinking of scraping the 400s and getting another FX5 or setting up a sump. I have a DIY 29 gallon one I can use.
As comparison my drilled 90 has a 20 gallon sump (rated for up to 120 gallons). It doesn't seem like enough for a 220 to me, however a lot of it depends on your bio-load. Any ideas on how you will stock it.
BTW $120 for that is a ridiculous deal. Congrats and welcome!