I am not a big fan of the many potions,or in my view,,, snake oils out there that promise to speed the maturing process and have always used a dechlorinator such as the two mentioned .
Seeding the aquarium with filter material from a disease free existing aquarium is the only other thing I would use in my aquarium other than dechlorinator.
I have heard success stories with product ..BIOSPIRA but have also heard not so good results as well. That product needs to be refridgerated in order to keep bacteria alive and perhaps shipping and handling issues (not keeping it cool) had something to do with those who had less than desired results. I am certain that there are those out there who would report success with this product or that product. I am merely offering my opinion on what has worked for me.
Five danios or five barbs would have been a better choice as far as using fish for nitrogen cycle but you have eleven. You will need to monitor the levels in the aquarium closely so that ammonia levels do not rise to lethal levels and kill the fish. Were it me,,, and it's not. I would take a small pinch of flake food and crumble it up in the palm of my hand about a dime size amount. I would offer this amount once,, every other day until ..ammonia,and nitrites read zero for a week and nitrAtes appeared.The fish will not starve and water quality will be somewhat easier considering the number of fish, to control.