Papa Red wrote:

I have had a thought, and have acted on it,...sort of. I was at
the corner grocery store earlier this evening, purchasing some roast
beef, and what do I see, but several one gallon jars of Dill pickles
sitting up on the counter over the meats, cheeses, et cetera. Long
story-short, just how good an aquarium would a well washed-out one
gallon jar be for a single Betta splendens/ Siamese Fighting fish?

It would work fine.
Assuming that you could get the pickle smell out

I kept my first two bettas in a pair of one-gallon plastic cookie jars.
The lids kept the bettas from jumping out (which may not actually be a
problem, but I was being cautious). I even drilled holes in the upper
'shoulder' of the jars to run airlines in for small internal filters.

As with any smallish container, of course, regular water changes are
important. And, luckily, very easy. I recall you mentioned that it
stays pretty warm in your area, so heaters aren't a concern, but
depending on the exact measurements of the jar in question, you might
even be able to fit a small, 25 watt submersible heater in it.

I am so wanting this to work so much, that I even paid $10.00 for
a whole gallon jar of Dill pickles

Woof. That's a lot of pickles to eat.

--
Eric Schreiber
www.ericschreiber.com