you could keep one on it's on in a 24x12x12 - but that would be a bit dull
you could keep one on it's on in a 24x12x12 - but that would be a bit dull
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blue acaras reach 8" so will need alot more space than a 2ft can provide.
id say you need a 48" tank to house one comfortably but you could have other fish 2 then.