Okay... sounds as if the 'safe guard' is your dechlorinator... correct? If so, that is the one chemical you need. A dechlorinator neutralizes chlorine and chloramine in tap water. It is needed.
Your tank will develop a bacterial colony that will change ammonia from fish waste into nitrite, then into nitrate, which you remove by doing partial water changes. While these bacteria colonies are developing, you test the water daily for ammonia. The ammonia will rise to toxic levels and then gradually drop down to zero. Then nitrite will rise to toxic levels and drop to zero. Then you will have measurable amounts of nitrates in your water. Whenever they rise above 20 or so, you'll do a partial water change to keep them in check. Once your tank is cycled you will vacuum your gravel with every water change (i.e., weekly).
The 'essential weekly treatment' is a way to get your money. And BTW, don't fall for pH-adjusting treatments either. They do more harm than good.
