I usually would wind up doing a 25-50% change every threeish days in my 5 gallon with one betta C: In a 10 with 1 betta, you can do the same. Basically, check every two or so days on the ammonia, and make sure its under .5ppm. When it gets past .25ppm, change the water like 25%. Really, its a check every few days, change as needed, until its done :D
Bah. Get some anacharis and BOOM, youre golden. Its best floating, Id say, and is an ammonia chaammmpp. Cheap, too, and grows like a weed. You usually get a ton, and it requires nothing special, nothing at all. It needs poop. Fish poop. Thats it XD <3 Hah!
To be honest, I dont trust that sort of stuff at all. I really dont! :( Unless its refrigerated, I dont see how "start up" bacteria is alive in the bottles. There are kinds like (I think?) stability that will help the tank cycle, by Seachem. I dont trust things that claim to "SUDDENLY" start the cycle :c
You welccommeee B: