Would you suggest getting an air stone to help keep the water moving? Or would the air flow from the filter be sufficient?
I've made rather discouraging experience about air stones. Firstly, they tend to get clogged in time. Secondly, they are noisy. Thirdly, I was unlucky with air pumps, even good brands (Eheim) - they are noisy. I prefer venturi. That, too, is rather noisy. Some people use sprinkling ramps with good results. If you hate any noise, you can arrange your filter outflow so as to make both the water column and surface moving. That's enough in most instances. But the surface and water column should be definitely moving.
Owning an aquarium is like being in fight club.
Not necessarily so. I like this forum a.o. because here, different approaches are largely tolerated.
Coming from a science background, where our protocols/methods need to be reproducible, I have found it all a bit perplexing.
An aquarium is a system way too complex to "calculate" its behaviour in advance. But steadily approximating to a "perfect" tank is, in my opinion, the thing that makes our hobby so thrilling.
I do think that a lot of the advice on the internet is just urban legend
It surely is. And things are even worse, because the core of it is hidden advertising.
Yet on this forum, there are people here with more or less scientific background. And years of experience. The risk of reading an outright nonsense here is therefore diminished.
I have no plans for CO2 at the moment.
To inject or not to inject, that is the key decision. With CO2, almost everything is different.
I think it's important not to follow high-tech methods while establishing a low-tech tank. People usually overdo. They have been persuaded that plants need nutrient rich substrate, over-priced fertilizers, spectrally advanced lighting, microbial inoculations, massive filters with expensive media, and so forth. All such things may be useful in certain situations in the hands of an experienced aquarist, yet as a rule, it's a waste of hopes and money. The greatest lie of all is perhaps the colonization area.
As for ammonia, Maq, I have seen a surge caused by decaying food make a Cory very poorly, and a WC make it better.
Well, many substances evolve from anaerobically decaying fish food. Cyanides and (organo)sulfides are more toxic than ammonia, and the list goes on.