I had 2 female dwarf puffers in a 250l with some danios and corys with a few plants,not heavily planted with no problems. Well none till the earthquake that broke that tank. I lost one of the puffers then but the other is now living in another planted 250l with CPD's and small rainbows of all sizes. She has not bit anyone so far but I'm not holding my breath once all the snails are gone. Not that I think they would bite to feed rather just bite due to being hungry angry. I would like to get her back into another tank as she struggles to get any worms away from the Furcata rainbows they are fat guts