How do you deal with growing out many young male betta fish from a spawn? A BETTA RACK!
A recirculating rack is a great way to keep lots of fish healthy with warm filtered water while they finish developing, and it makes it easier to change water for many bettas all at once.
My DIY betta "barracks" as it's sometimes called, was fairly inexpensive. I made it with lumber, paint, PVC, plumbing parts, jars, a trash can and a good pump. Oh, and some creativity and planning.
Here are some of the links I promised.
Containers: https://www.priorityplastics.com/
Uni seals: https://www.aussieglobe.com/
Drip plastic water valves: https://www.jehmco.com/html/air_accessories.html
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