How to Keep a Small Aquarium Without Being Cruel to the Fish 
By Beth Skwarecki US Source: lifehacker 9/27/2021
Beth Skwarecki
Credit: Shutterstock
In a past life, I worked at a pet store, and one of the most heartbreaking things I saw on a daily basis was people who came in, little kid in tow, asking for a goldfish to put in a bowl. Goldfish are big, messy fish, and they grow to be 8-12 inches long. Depending on how persuasive I was, these folks went home with either a sad child or a sad fish.
 

The truth is that fishbowls and tiny tanks are not really suitable for any fish. Stores sell them because people buy them, and people buy them because they want something that will sit on their table and look cute. But if you want to keep fish, you owe it to them to research what they actually need, and assemble a tank that takes care of those needs.
Make it at least five gallons

There are fish that can thrive in a small tank. Not many! But a few, like bettas, can do well here. The catch is that we’re not talking about a vase or a mason jar; fishkeeping experts agree that the minimum size to properly care for a betta is about a five-gallon tank.

 
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