I had tried keeping Betta macrostoma twice before and failed. This is my third time trying and I finnally able to keep it alife. And manage to breed it. Yes!!!!!!!!!!
Since the wild betta is getting rare. I hope this post will help others in breeding this species and keep the strains going on.
Macrostoma prefer soft and acidic water. pH 5 is what I aim for. Higher pH will lead to skin infection and often fatal. I lost two fishes because of that. Peat filter medium is good way to reduce pH. Alternatively you can use ADA Amazonia II soil. The fish prefer lower temperature. I used to keep them in room(28-30C) temperature, they survive but never thrive. I am now living in a service apartment with 24 hour aircondition. The temperature is kept at 25C with a heater.
The fries is able to survive in the heavily planted aquarium without feeding. I suppose there is plenty of macro-organism in the tank. For those that I harvested, they accept newly hatch brineshrimp readily. Once they accepted brineshrimp, they readily accept frozen brineshrimp/dapnia and dried food.