Bettas are beautiful fish, but because of their long fins, they are also very weak swimmers. Fast-moving water is hard for them to swim against. I noticed our own betta, Blueberry, was really struggling.
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Let me know if you successfully build this diffuser - I'd love to see it!
I designed and printed this drop-in replacement water diffuser for my Fluval Flex 15 gallon tank. It has a threaded end that matches the stock water pump outlet, so you can just screw it into place. The result is a much more placid tank, without reducing the throughput of the filter pump.
OK, he may be struggling a bit here, but you should have seen him struggle *before* I installed this new diffuser!