Response to my questions about Rivulus (cynodichthys) sp. Kura Yala PAN 2009-29 purchased from Ken Normandin: 
"The sp. Kuna Yala are a “new” species in the R. brunneus group that I (With Andre Schonewille, John and Katy Boylan) first collected in 2009 in Panama and re-collected them again in 2012.  Since they were collected at the same location in different years, I stuck with the original site designation.  They were collected in a clear, small mountain stream along the margins in leaf litter and plant roots, as well as in a muddy, seepage outflow from that same stream in very shallow (sometimes as low as an inch or less) water.  They do have a name pending, but I can’t give it out until my paper to describe them is published.
Their maximum size is about 3”, nose to tail, so I think your pair is about 2/3 full size.  For me, they are relatively easy to keep and breed, they’ll eat just about anything, including a good flake food.  My normal feeding routine rotates between grindal worms, midge fly larvae, bbs and flake food. In a well planted tank they will reproduce easily and for the most part leave the fry alone in the tank if well fed.  They breed in a manner consistent with most of the “Cynodonichthys” type Rivulus.  I don’t monitor water parameters here, but when I collected them, the pH was around 7 and hardness was at 70ppm.  I do use primarily rain water and treated well water here, so I would guess my hardness is pretty close to yours (mine is 120-140 ppm).
If you decide to try to pick eggs, they are a mop spawner and will lay eggs at all areas of the mop.  Eggs are a little sensitive to handling and if not careful, they can fungus up quite easily.  When I collected eggs (many years ago, it seems), I kept them on a damp piece of quilt batting soaked with acriflavine/water solution and I believe they took about 3 weeks to hatch."  To be Contd.

Here is the rest of the email from Ken Normandin (posted with his permission). This continues from previous post which exceeded the word limit.
In water, the time can be about a week less, but I didn’t use water incubation much since even with acriflavine, the eggs can fungus easily.  Fry can take newly hatched bbs immediately after hatching.  However, as I mentioned before, I raise them in the tank with the adults until they’re about 1/2” long then move them to their own grow-out tank.  Even as small fry, they will accept powdered flake food readily.