So I have a 12 gallon tank and just have a HOB filter with a filter pad carbon and biomax. I want to start doing Carbon and GFO but stumped if I should just put the two in a filter bag and put it in the HOB filter or I was thinking of buying BulkReefSupply Carbon and GFO Reactor. Will the carbon and GFO do fine in the HOB filter of should I get the BRS Reactor