2 questions (one about corys and the other one about pearl gourami)

[Meg0000]

Hello, I have 6 bronze corys all about 1.5 inch and I was wondering if at this size they are already mature and able to breed. Also I have 3 Pearl gourami 1 male 2 female and I would like to have probably one or two more female. Do these kind of fish establish a hierarchy and then I can no longer add any more of them or it would not change anything?

 

[Colin_T]

Don't add any more gouramis.

Corydoras are sexually mature when 12 months old. Females look fatter than males when viewed from above.