They are, but tank conditions have to be just right. My dad has swordtails and he also has some biting fish and a pleco that is 2 feet long!
The mom of Nemo, Athena, died shortly after Nemo was born. Same with nemo's dad, Axel. (Pixar and Disney lied. The parents are not Marlin and Coral.) I had 3 females, Yuki, Maureen, and Yellow Submarine, in with my only male, Ringo. No more baby fishies that I saw. Ringo died too.
I love my 6 baby creamsicle mollies and swordtail boy Nemo!
My Beloved Bettas -
John Lennon (a.k.a. John or Johnny) - Dark blue, green, and red VT male. R.I.P.
Opal - White, pink, and purple VT female.