How many female bettas can you place in a ten gallon tank?
the rule of thumb is each inch of fish should get 1 gallon of water
and this rule can also be affected by the following:
|the more aggressive the
females, the less you can keep.||the less plants you have in
there, the less you can keep (cause they won't have any hiding
place to rest)||the less often you clean your
tank and change your water, the less you can keep||the less efficient the filter,
the less you can keep.
With a power filter with good media and weekly water changes, you might be able to keep about 6 females in a 10 gallon tank PROVIDING that they do get along well with each other. if they don't you might only be able to keep ONE. ;)
I would never keep more than 6 even if they do get along. If you are using a low end filtering system (corner filter etc) than I would only keep 4.
I hope this helps you.