Is this an "Other Monster Fish"? But your right, its just a female full of eggs. I have breed harlequins and hengelis (similar rasbora). Recommend you collect rainwater and use a tank that gets morning sun. If you need an additional trigger, mix a handful of rich healthy dirt into a header tank, mix thoroughly and let it drip into your breeding tank overnight. 2 males to a female if possible over bottom spawning mops or marbles. Start a green water culture asap and a banana skin infusoria culture as soon as you see eggs.