On this form many folks do the all female in a 10g tank, however, IMO/E a 20g or larger works much better, IMO-the 10g is too small for the proper number of females needed to keep the aggression down....with that said....I have read lots of post here about others success in using the 10g all female tank...so it is up to you on what you want to try, but the very least a 10g and 4-5 females at most and IMO that is stocked pretty tight with risk of a female getting bullied due to too few females...this is just my opinion.......