" I don’t really know what “armor si” is"
It is
General hydroponics silica. It's called Armor Si. It's the most abundant element on earth. It's very important for overall plant health and disease preventions plus numerous other things. It one of the most important additives you can use.
And YES, if you are using
Hydroguard and h2o2 together, well all I can say is your making someone happy somewhere but it not your plants. One way or the other, please, but not both, your fucking up your plants. Either a sterile grow or a live grow. I do a live grow. By the time you get to 4-5 grows in a RDWC you'll look back on this and laugh!! lol It's all in the learning curve man, don't sweat it.
When I first started growing not too long ago I did the same things. I have more shit that I bought and don't need and didn't need but sure as hell thought I needed! I started with 4 sites in a 4x8 room, now I have two. That's all I need. I use
General hydroponics because it works and I can screw things up with it just as easy as the expensive stuff. I have TONS of air pumps and don't even use one on my current system. Now I'm ready to lose the chiller too.
Hydroguard and enzymes are working fine for me. I just keep refining and simplifying. Try not to stress to much about your plants and concentrate more on learning about growing, I know, easier said than done. lol
You can flush with vinegar or Florakleen from GH. Vinegar is cheaper. You'll switch the in-lets when flushing. In thru the out door and vise versa. Lots of info on flushing chillers.
Well, good luck man and keep asking questions, it saves you money! lol