They aren’t old enough. Most thumbnails can breed as early as 6 months out of the water, but larger frogs most often will not start breeding until they are over a year old. Tweaking variables to get them to breed sooner is at best futile and at worst unhealthy for the animals.
Want to learn more about keeping reptiles and amphibia [...]
One of the joys of keeping Poison Dart Frogs is breeding them. I have taken what I have learned from other froggers and read many books and articles to develop my methodology for breeding Poison Dart Frogs. I tweaked this method based on what I observed as I have bred thousands of frogs over the years. The following is my methodology.