I currenly have a 20 gallon tank and for some reason my dorm room is much hotter than it should be, soo the tank is sitting at 70 degrees i know this is not optimal temp for them and i do try to put ice bottle in with them but that is very difficult for me to do and it only brings the temp down to 68-69 when i do it, and that only lasts for a lil bit, even though this temp is fairly high, should the axolotls be ok at this temp for an extended period of time?