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DIY dividers take 1
DIY dividers take 2

If the dividers aren't tall enough to reach from bottom to top- just cut another the length needed.

4-5 bettas divided I would say, as it gives them enough room to be comfortable in. 5 bettas would be 4 gallons, minus a few inches off the top (to prevent jumpers) and a couple inches from substrate.. so it would equal to roughly 3-3.5 gallons each, a good number.

Good luck!
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