i think youre ok. i never test my water, never acclimate the fishes. i just dump them into my tank. my ember tetra started playing with itself the first day. just dump it in and dont think about it too much. fishes will live. your water gotta be really messed up to dump them in and they die. even brackish water fishes i just dump them in. even when adding tap water without treating the water it's fine they wont die.I've heard ember tetras prefer soft, low-pH water. I want to get some for my betta tank (he's solid black).
I know people say "fish can adapt to any parameters" but still. My pH always comes up as bright yellow on my master test kit (lowest possible) unless I add coral, which I might since the filter is a HOB. My KH is 2 and my GH is 8. Are those parameters good for embers?