Okay, I'm gonna jump right in.
I know a lot of people think such additives are pure bunk but it worked for me.
I used SeaChem Stability after my 5-gallon tanks had been cycling for less than two weeks. You do a full dose on day one and a half dose for six or seven days thereafter.
Within that time, the parameters stabilized and have remained stable for almost three months. I haven't redosed as directions say you can.
I have one Betta and 15 shrimp in each tank. I do partial water changes once or twice a week of about 10% (shrimp are easily shocked so I keep the changes small). The only additives in my tank are SeaChem Flourish and Excel (half-dose because of the shrimp) and Prime when I change water.
Hokum or not, I will use Stability with each new tank.