I am in the process of cycling a 5 gallon with 1 Betta. Since Saturday, I have noticed that the water has started evaporating at a very high rate. I do 50% water changes every day around 9pm. When I get up the next morning at 7am, 1 1/4" of water has evaporated. I fill the tank back up and when I get home from work, 1 1/4" of water has evaporated again. The temperature is steady at 80F. Does anyone have any idea why this is happening?