Hi does anyone have any ideas how to keep aquariums cool? I currently use ice cubes in Ziploc bags enclosed by another one( just in case one gets torn open). It's not a great strategy because the ice thaws in like 10 minutes and I need something long lasting. My aquarium has 2 female swordtails and 5 female bettas and the temperature is 83F. I read somewhere that you should not keep swordtails in temperature higher than 82F. What do I do!!??