both would be fine in a tank that size, as long as you dont intend to keep anything else in there that is large enough to eat them!
Also, be carful with your filter selection. The chilli rasbora I have seen have been tiny and are likely to get sucked in if your filter inlets are large enough.
Somehing else to think about would be being able to see them. In a 125L if you only have say 6 of either you would need to sit very near the tank to see them! You would be better off with a group of around 20