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You've actually *seen* this happen, have you? I've kept various bettas in 20L tanks (edited to clarify, since I'm in a metric-system country, that I mean 20 gallon 'long' tanks) over the years and never had anything remotely resembling that problem. Pet stores do like to try to convince people it's perfectly ok to keep bettas in tiny tanks, and alleging they can't handle bigger tanks *is* one of the arguments used. It's not any more true than the other arguments used, though, IME.
They can get shredded-looking fins from being picked on by other fish, rubbing against sharp-edged aquarium ornaments, or infections associated with poor water quality.
The pools that bettas live in, in nature, are about a trillion times larger than a 20L tank anyhow. Really. (Although, wild bettas don't have the hugely long tails that aquarium strains do, either)
I would not hesitate one moment to put bettas in a bigger tank as long as they have congenial tankmates.
Have fun,
Pat
You've actually *seen* this happen, have you? I've kept various bettas in 20L tanks (edited to clarify, since I'm in a metric-system country, that I mean 20 gallon 'long' tanks) over the years and never had anything remotely resembling that problem. Pet stores do like to try to convince people it's perfectly ok to keep bettas in tiny tanks, and alleging they can't handle bigger tanks *is* one of the arguments used. It's not any more true than the other arguments used, though, IME.
They can get shredded-looking fins from being picked on by other fish, rubbing against sharp-edged aquarium ornaments, or infections associated with poor water quality.
The pools that bettas live in, in nature, are about a trillion times larger than a 20L tank anyhow. Really. (Although, wild bettas don't have the hugely long tails that aquarium strains do, either)
I would not hesitate one moment to put bettas in a bigger tank as long as they have congenial tankmates.
Have fun,
Pat
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