NetMax wrote:


Thanks but the 60cm might have been for the male with several females.
If they were recommending a minimum of 60cm for a single Betta, then I
would have been curious regarding their justification. If you have the
time and are inclined... I imagine that the article was credible enough
to include in fishbase.org.

This is a recommendation of the German Ministry responsible for animal
protection for keeping pet fishes (fishes kept for food production are
not covered in this recommendation). What they say is that small tanks
are more difficult to maintain and that therefore a tank size of 60 l is
recommended (54 l required) as a minimum for the permanent keeping of
fish. On top of that the tank needs to be big enough for the species,
size and number of fishes (their web site has a table with
recommendations for the most common species).

Note that this is for permanent keeping; transport, sale and similar
temporary activities can be done in smaller tanks where appropriate.