IMO Xtreme is in the same category as Hikari. Their food is sourced out to a commercial mill (Zeigler) and there's rice, soybeans, and 'extra' ground wheat, beyond the wheat flour that is used as a binding agent. More fluff, less good stuff.
To the Canadian, there's a local product made that is hands down higher in quality than Xtreme, it's called Northfin. You might want to check that out. 10+ yrs later and I still stand by NLS for all of my fish, but if you are seeking an alternative Northfin makes a very good food as well.