Skip to Main Content



The water quality in our system at Yale is very stable. The water is normally 200-250ppm, which is desirable for raising tadpoles. Our main recirculating system also contains monitoring and dosing equipment designed to prevent wide fluctuations in water quality.

The temperature, pH, and conductivity are monitored. There is capability to monitor dissolved oxygen and redox potential, but we do not have these set up.

Manual water quality is performed once a week, to confirm the monitoring system is functioning properly.

Monitoring equipment mounted on wall above filters Systems for dosing sodium bicarbonate and salts to maintain pH and conductivity. These are controlled by the monitoring system.

Depending on the equipment you have, and your local environmental conditions, you may experience varying issues in maintaining water quality desirable for raising tropicalis. We find the monitoring and dosing system to be invaluable, and would recommend it to anyone considering a recirculating system. The initial added cost will pay itself back many times in terms of reduced labor in water quality management, and more importantly in preventing loss and illness of important animals.

Water temperature of our recirculating system is maintained at 23.5 - 25C. A slightly higher temperature (25 -26C) is desirable for tadpole growth, but our adult frogs prefer a cooler temperature. We find egg production and quality tend to decrease at higher temperatures, and so have compromised at a mid-range temperature. We control the water temperature by maintaining the ambient room temperature slightly cooler than desired for the water (23C), and relying on heat produced by the motors and pumps and UV bulbs in the system to heat the water to the desired level. We also have a supplemental heater in the sump to heat the water if it should fall below 23C. Relying solely on directly heating incoming water is dangerous, as it may be difficult to cool the water if necessary. High temperatures can be very detrimental. Temperatures above 31-32ºC cause the adult frogs to stop eating and become emaciated.

The light cycle is 12 hours on and 12 hours off year round.