This would see an annual change from 26 to 32 in summer but with good stability over days/weeks. I have bought/installed a chiller based on advice from everyone (I live in Sydney with Metal Halides), so maybe I am dreaming to think it can be kept to 32 maximum. I haven’t had a summer yet with this setup so I don’t know. I am skeptical and selective about taking advice on anything in this area (marine aquariums) but there seems to be a fairly consistent opinion here. Am I best to have the temperature range on the chiller set higher (say from 27 to 29) so it cycles less?