ShinySideUp
Fish Herder
If a book gives a temperature range for a particular species of fish, let's say 24 to 28 degrees Celsius, what advantage would there be to keeping the fish towards the higher end of the range as opposed to the money-saving lower end of the range. Not heating 200 litres of water by four more degrees than necessary would save a lot of money over a year so why would I need to do it?