Ice packs to chill tank in summer?

[lastlight]

i threw in about 10 water bottles (didn't drain any water and they never burst in my freezer). took about 2F off my tank temp and quite fast too. took about 10 min for ~ 130 gallons. too fast for my liking and my hot main floor (29C) raised the temp back up in less than an hour. a fan on the display is a better idea i was just too lazy to set one up.