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Thermometers

This is a discussion on Thermometers within the Member Submitted Articles forums, part of the TFK Resources category; --> Tracy asked what others do so I shared I'm not saying not to get one. I'm waiting for the infrared app on my phone......

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Old 08-06-2013, 12:05 PM   #11
 
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Tracy asked what others do so I shared I'm not saying not to get one. I'm waiting for the infrared app on my phone...
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Old 08-06-2013, 02:56 PM   #12
 
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I don't monitor temperature at all (I have one thermometer). My tanks are unheated. I know what the ambient air temp is, so I have a good idea of what the tanks are at.

There is this obsession with keeping fish at the top of their preferred temp range, as if that's somehow what's best. Believe it or not, many of the "tropical" fish in the trade don't need 80 degree water.

Temperature fluctuations are normal in nature - only in our aquariums do the fish get a constant temp.....
It's not true that in our Aquariums they maintain a constant temp even with heaters. There are always minor fluctuations, especially as the house temp fluxes (yes our own homes don't always keep a constant temp).

Of my 5 tanks, it's no surprise that I see temp fluxes. All of them are heated. But it's always a slow few degrees that seems to be related to the temp of the house and how long/frequent the AC is running(or not). While I agree that not all fish need that 80 degrees, there are fish out there that are quite sensitive to not being in the proper water temp. I live in a home where it is usually cold and the windows are drafty til we get that fixed. My tanks loose a lot of heat to this along with the workings of the AC. So for someone like me it's not feasible to do no heaters.

In the winter though it is worse.

OP, you ought to learn to pay attention the behavior of your fish. They will let you know when the water is too hot or too cold. So will the plants if you keep them. I rely more on my animals to tell me what is going on over test kits, and temp readers.

Last edited by Sanguinefox; 08-06-2013 at 02:59 PM..
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Old 08-06-2013, 03:30 PM   #13
 
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Originally Posted by Sanguinefox View Post
It's not true that in our Aquariums they maintain a constant temp even with heaters. There are always minor fluctuations, especially as the house temp fluxes (yes our own homes don't always keep a constant temp).

Of my 5 tanks, it's no surprise that I see temp fluxes. All of them are heated. But it's always a slow few degrees that seems to be related to the temp of the house and how long/frequent the AC is running(or not). While I agree that not all fish need that 80 degrees, there are fish out there that are quite sensitive to not being in the proper water temp.
It's all relative. As you yourself said of your own tanks, its a slow change of a few degrees. Compared to the changes that occur in nature, that's pretty constant. Like I said, it's relative to that which you are comparing.
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Old 08-06-2013, 04:47 PM   #14
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Hello:
Jaysee opinion is one that I will go with. You folks that are always fiddling with you aquariums are just making more for you to worry about. Fish keeping is easy if you donít go out of your way to complicate matters. You can complicate, by improving your aquarium right into a horrible experience. This has happen to me and I learned the less I interfere with the ecology of the aquarium the better off I am as are the critters.

Purple possum rides at midnight!
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Old 08-06-2013, 04:50 PM   #15
 
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Purple possum rides at midnight!
So is this ^ an offer or just a statement? just curious...
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Old 08-07-2013, 07:27 AM   #16
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Hello Agent13;
Itís a pun I always laugh at the thought of a purple possum who rides at midnight. But if you want it could be either an offer or a statement.

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Old 08-07-2013, 10:37 PM   #17
 
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The original posters question was " are there any very good and very accurate thermometers that others could recommend?

Anyone else?
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Old 08-08-2013, 10:10 AM   #18
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Hello Tracy Bird;
You are right we are talking about excessive accurate thermal measuring devices which do not provide the desired results. There are several problems with these measuring devices. One of the problems is these devices promote the concept that the reading is representative sample of all water molecules in the water column, which is impossible thus forming a false sense of safety and security in water temp. for the fish keeper.

A simple explanation should do and that is the notion of liquid thermal dynamics that states all liquids are heated not by radiant heat but convection energy that operate on the principles of gravity to form thermal convection currents. It works just like a pot of boiling water, when thermal energy is transferred by convection to a water molecule this molecule raises displacing cooler molecules which gravity pulls down to the source of thermal energy creating thermal currents. Thermal currents mean water molecules are in constant motion gaining and then losing thermal energy in the trip around and threw the water column making it impossible to measure a representative sample.

These excessive accurate thermal measuring devices are right up there with 3-D printing in an effort to market these to fish keepers, who in my opinion have no use for them.

Note: disclaimer just because I have an opinion is not proof that I know what I am talking about.

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Old 08-09-2013, 07:44 AM   #19
 
I totally share your frustration. My new Marina heater was set to 78, Marina floating thermometer #1 read 84 degrees and Marina floating thermometer #2 read 81 degrees. Ridiculous fluctuations for devices designed to measure temperature. At the advice of my LFS, I took the floating thermometers out of the tank and measured them against the two house thermostats. After recording all the readings, I learned the two house thermostats are reading the same, and one of the Marina floaters was consistently within 0 - 1 degrees of the house thermostats. Turns out the heaters were reading low so I now disregard the numerical setting and adjust based on the floating thermometer reading.

I'm still not fully comfortable I know what the real temp is, so the infrared device is very intriguing. But now I chuckle when fish profiles suggest that say fish "A" prefers a water range 2 degrees warmer than fish "B". How many of us really have the level of precision?
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Old 08-09-2013, 12:19 PM   #20
 
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Chuck,
The OP asked about a cheap accurate thermometer. The thermometers available to the aquarium industry usually say plus or minus degrees when it comes to accuracy according to the specs. Pop shared a lesson in thermal dynamics which tells us that temperatures in an aquarium can be different in other locations. How much depends on water turn over and currents. So its possible for a 1 degree or more difference at the bottom and top of tank. So I place my sensor in the middle knowing there is a low and high range around that middle. But the difference between low and high is most likely 0.5 to 1 degree. In some tanks, with high intensity lights, may have a range further apart.
So one has to check the specs on a spirit, mercury or infrared thermometer to what the degree of accuracy is.
So fishkeepers should try to stay within the recommended temperature range for the fish and plants and not worry about too much about it except if the temperature is approaching the low or high range.
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