You could do that, or go to Lowes and get one of those huge 2.5 cu.ft. peat moss bags. Just make sure that it doesn't have any ferts in it; you can just boil the peat moss in a filter bag or strain off the extract before you pour it in the tank to remove peat bits. Those bags are like $6-7 for an essentially lifetime blackwater extract source.
Last edited by ngrubich; 06-20-2013 at 12:15 AM.