Since i already have a canister (fluval 206) can i use that? may seem a bit of a basic question but i dont know... Anyways wheres the best place to start when doing that? put it into the intake and let it go through the canister?
You can use the Fluval filter.
For a reactor, it is best to put it on the filter return side, so that detritus does not accumulate within the reactor.