Freshwater Aquarium Temperature
How to measure the temperature of freshwater aquarium is a skill that all fish hobbyists have to know. Merely thinking that the water inside the fish tank will stay at whatever temperature you have the home thermostat set on is wrong. The water in the tank will not become the same temperature as the room. The fish are subject to different elements than the room is. For example, the light from under the hood raises the temperature. So assuming that the water is fine without any input from you can be detrimental to your fish collection.
Aquatic creatures cannot maintain the right temperature themselves if the temperature inside the tank becomes too hot or too cold. They have no way to set or reset a thermostat and as a result of changes can become stressed or worse. An aquarium thermometer is not a luxury tool for your aquarium world, it is an absolute necessity.
No matter what temperature you set your home thermostat on, you will notice the temperature will change over the course of the day sometimes by only a few degrees sometimes by a lot depending on the time of the day and the things that caused the change. For example, in the summertime, if you set your air conditioner to come on at seventy three degrees, you might find the temperature reading inside the living room is a nice seventy three. But suppose you have had family and friends over all day. They have been going in and out of the house and you have been in the kitchen cooking for them. You feel warm so you check the temperature in the kitchen and discover the thermometer reads that it is seventy six degrees. The extra people in the home and the heat from the cooking raised the temperature.
The best temperature for a fish tank was set under optimal conditions, which means you must be prepared for circumstances that are not always optimal. You need a thermostat to keep a check on the water. These are very inexpensive tools that will keep you apprised of the conditions inside the tank. Some of these thermometers on the lower end of the pricing scale can be placed inside the water either secured to an inner wall or free floating and you can read the temperature.
There are thermometers that are secured to the exterior wall of the tank and you can read the temperature that way. Perhaps one of the best kinds is the digital thermometer. The way it measures the temperature is by placing the attached wand inside the water. A digital display will show you what the temperature reads. Some of these models will keep a digital rs485 temperature recorder stored in the memory and can even warn if the temperature changes become too high or too low.