Hello guys. I am asking for ways how to keep my axolotls tank cool aside from the method i use. I use ice bottles and switch them out twice a day (they are very large bottles, maybe a foot and 8 inches), and they last for all day long. Im currently talking to a guy who Is making a chiller for me and is almost done. Once i have the chiller, what do i do in a brownout (when electricity goes out)? Aside from ice bottles, i doubt 25+ large ice bottles could cool a 75 gallon tank. Currently Ponyo is in a 20 gallon and has cooling fans and ice bottles and it works just fine. Temperature sometimes spikes to 21 celsius but only for a few hours at most. What are other cooling methods you guys can reccomend? Also my large tank has 17 inches of water so i doubt that cooling fans would have any effect at all.