I think you stated the biggest reasons why DSM is a plus with Amazonia. 1. After the 6 weeks or so with a dry start when you flood your tank it's basically insta cycled and ready to go. 2. No algae to worry about!!!! Probably the biggest benefit of DSM, this allows you to increase your lighting to 16-18 hrs a day for faster growth without concern for algae. The Amazonia will provide enough nutrients and Co2 can be drawn from atmosphere. The only real concern is mold but minimal ventilation should eliminate that.
Dan
Dan