Unless there is some type of thermostat on the pump then no. Pumps such as the one used in the EZ cloner some times cause the water to raise over 80f. This could be the downfall to them after showing signs of roots. Maybe they got cooked? Again I am no pro so hopefully someone else can chime in. But my bubbler clone is on the money and for the most part its zero maintenance. The water is NOT the same as whatever the room temp is so if thats how you have been determining the tempthen you should grab yourself the thermometer and get it in that water. :thumbsup: Good luck