Heh, that site says a lot of this I dont agree with >~>"
Dont add it unless you need it, and if you have live plants, dont add it because it will kill them.
The needed dose for AQ salt, in order to do ANYTHING is 1tsp/gallon. So, in a ten gallon, you need 10tsp. Using 5 is like taking a half dose of asprin. It does nothing, and youre just getting used to it over time, building a resistance.
Cycling isnt what you think it is btw, I can tell by what you said. I can send a pm about what it is and how to do it, if you would like.
And derp derp derp seconding the 4-6 bettas, keeping it HEAVILY planted with fake or real plants and hidey spots.
Be prepared, though, to get some hurt fish, and if it doesnt work out, plan on giving a few away. You can divide that tank max of 4 times, so if it doesnt work out, you can keep four in with dividers.