Ben, I'm a total believer in the raw shrimp method. We used damsels to cycle our 72, I hated it, the poor fish act like they are suffacating(sp), and we didn't seem to get a very good cycle. We cycled our 200gal with 8 raw jumbo shrimp, 6 weeks later the tank was totally done cycling and we have not had one problem with any of the levels, all reading are where they should be. Plus I didn't have to feel bad watching the poor fish try to breath. Lisa