MermaidMel
Official Forum Weirdo Detective
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I have one of my Betta's in a 2g tank but as i've got other much larger tanks with already cycled water I do 50% changes to his water every couple of days. He is quite happy with this. No form of filtration needed.
Do you mean you replace the 50% with water from one of your other tanks instead of straight out the tap?
That sounds like a plan to me