Your search for "medaka" revealed the following:
Jpd Tanemizu Water Purifying Bacteria
From $15.50
Great PSB bacteria made specially for Medaka ricefish!
Medaka Ricefish Craze
The craze about Japanese Rice Fish (Oryzias Latipes) is ongoing in Japan. The craze for these exotic fishes has since spread across the globe and eventually Singapore. So, what is this craze about and why these fishes can range from $1SGD up to the recent highest auctioned pair at $12,000SGD....