Tank mates for a Southeast Asian Blackwater tank

[Okami]

Im setting up a southeast asian blackwater tank and its a nano. Im thinking of adding Mini Roseboras which do not or barely grow an inch. Any one know if they tend to be a nippy species? dont want to add them and my Betta get chewed on.

[Bombalurina]

I've had microrasboras (borasas maculata) and they weren't nippy. To my knowledge, mosquito rasboras (borasas brigittae) aren't either. Both are very pretty. :)
I honestly don't think they are big enough to nip anything. I was worried my betta would eat them at first, but they got on pretty well, til I changed the substrate, didn't even think about the effect on the pH, and killed them. :(

[Okami]

Thanks! Good to know when im done with the biotope ill introduce some into the tank