The only thing I add to my water during a water change is chlorine/chloramine remover. If your stress coat does those things as well as a few other things that's probably just fine--go ahead and use it--it shouldn't hurt anything.
Also, when adding the chlorine treatment...
You do NOT need to treat 10 gallons of water. You only need to treat the new, fresh water you are adding to your tank. So if you're adding 1.5 gallons of fresh water, you only need enough treatment to treat 1.5gallons of water. Read your directions. It seems like many of them say "One scoop or capful for every 10 gallons" so in this case, you could just guess how much would sufficiently treat 1.5 gallons...so like 1/8 of a capful or so.
As for the other thing, I really doubt you need it...
Out of curiousity, what is the brand and name of product so I know what you are talking about exactly? Maybe that would help me give you a little better advice.
Otherwise, I think you're set.
Once a week PWC (partial water changes) via gravel vac (siphon) and treat the new water before you add it. It wouldn't hurt to change more water, like 15-20% too, if you feel like it. There is no such thing as too clean of water.
I should add, try and get the new fresh water close to the same temp as the tank...too hot or cold can shock the fish and stress him out.
Best of luck
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