I have a 60 gallon tank that I can't keep lower than 79 degrees. Some days it gets to 80 degrees. I have no heater and its not in the sun. I don't understand why its so hot all the time. Can someone help me figure out how to lower and keep the temp low?! I want to get neons and corys but they like temps around 70-74. I don't want to buy any fish yet because I can't get the temp right. I currently only have a mystery snail. Ive had fish tanks for a while, and I have never had this problem. I have a canister filter and I HOB filter run 24/7. I do have extremely bright lights to help my plants grow. I keep the lights on for about 10 hours a day. Could that be the issue?