The kitten incident would be really cute if you'd have caught it on a video recorder.
About all those chemicals: if memory serves me -- and it seldom does -- nitrite is nitrogen with three oxygen atoms, nitrate has four oxygen atoms, and ammonia is a combination of nitrogen and hydrogen. All three things are are reactive and are the result of fish digestive byproducts and plant decay. Most are, in turn, converted by bacteria into plant food. That's why a planted aquarium tends to be more stable than a non planted one. All those little cooties work happily together until they get overwhelmed by too much pet poo, plant decay, fish food, and bad cooties. Antibiotics will also kill the good cooties.
All that is just the long way of saying your aquarium will become a dangerous chemical soup if you over feed, over crowd or over medicate. Partial water changes just trade filthy water for good water. An extra air stone may also help.
What's this? You don't believe in cooties? Shame on you! I know they exist, because all the kids in grade school kept telling me I had them.
