Hiya and welcome to Aquariumadvice bkbjmb
Heh, its rather amazing how much crap is out there for a simple fish tank isn't it? And if you're like me, without having the info first it all looks so necessary!
Actually, very little of that stuff is needed/works. My first suggestion is to do some water changes to get most of all those chemicals out of the water. Maybe 20% a day for the next 5 days with treated (dechlorinated) water, making sure to match the tank temps. Your tank is nowhere near cycled, so it won't have a necessarily negative effect there; just means it will take a little longer to cycle.
Buenos Aires tetras are hardy lil buggers, and silver hatchet actually come from a pH of 8.0 so your pH of 7.6 is fine; I wouldn't mess with it. Can the Ph stuff
Easy Balance is a joke IMHO
. There is nothing out there that can take the place of gravel vacs and water changes. Remember, everything that goes into the tank STAYS there unless you take it out. Even food, although it winds up in a different form *grin* If you don't vaccum it out, it will sit and rot in the substrate. Yuck.
B-Clear and all those other "water clarifiers" aren't amazingly useful either IMHO
. What they do is cause all the crud floating in the water to clump, supposedly so they can be caught in the filter. What usually happens is the stuff clumps and falls into the substrate, and lays there till you take it out (by gravel vacs).
And you haven't screwed anything up; you're talking to the woman who cycled her first tank with 2 angelfish and had NO idea what she was doing LOL
. You're doing the right thing by going for info so you CAN do the best for your fish
Lastly and most important, you'll need to understand the nitrogen cycle to keep your fish happy and healthy. I strongly suggest you read this site; it will explain what happens during the cycle, why its so important, and what you can do about it: http://faq.thekrib.com/begin-cycling.html
Also, if you haven't bought nitrogen test kits yet, make that your next fish tank purchase. Be sure to get ammonia, nitrite and nitrate tests; the vial/liquid tests are much more accurate then the dipstick ones.
Oh and btw
, nice choice on the Emperor; love the bio-wheel filters