* Keeping freshwater fish outside during spring and summer is a remarkable way of keeping fish. In a way, there's much more motivation to create a natural habitat in comparison to an aquarium inside the house. For in a regular aquarium people have the urge to create a clear water biotope where one is still able to watch the fish more clearly and in general this means a less natural habitat. But once a tank is used outside and it has to blend in in the backyard... one is more urged to use vegetation which are meant for ponds and the use of other natural ornaments. And an enviroment like that is a much more better housing for the fish as we speak...

* Water temperature can be of importance to determine the sexes offspring. This goes specifically for livebearing tooth carps in general. When a female is kept at lower temperatures during pregnancy, a bigger male offspring will develop. But in case the temperature will be increased during pregnancy, more female offspring will be born

* Breeding problems? In free nature a lot of fish are stimulated to reproduce themselves after a rain shower occurs. You can simulate this situation by refreshing some parts of the water in your tank on a frequent bases and there will be a higher ratio of spawning and mating fish.