Fish In A Jar?

It's not just Oscars it's any fish. A jar is not a home for any fish.

Edit - Unless it is a 5gal+ jar for a betta though even this is debatable due to the limited surface area.
 
i agree 100% was just sitting here trying to picture Bo squashed into a jar :lol: -sorry
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The only "jar" that you might be able to keep a small fish in is a large battery jar. They are all glass jars made to assemble large industrial batteries in and can sometimes be several gallons in capacity. One of those might suffice for small fish that get frequent water changes, much like a small aquarium would need. These days, even large industrial batteries are being made with clear plastic cases and I doubt that an old fashioned battery jar could be found newly manufactured in the last several years.
 

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