Correct Temperature

78+. The trick is to keep it hot enough so the temp stays steady when lights are on.

Although if you read forums, you'll quickly find that a common problem is when the heater gets stuck "on" and the tank goes north of 90. I'd recommend a good temperature controller as a backup to the submersible.
 
+1 on heater getting suck on the "on" position. Cooling new tank off now that was up to 92 degrees, heater stayed on. Cheap Wal-Mart brand for ya. Luckily, just started it, no fish or corals in it yet.
 
I've got my heaters set to come on at 76 and 77. I don't think they ever come on :) The tank normally runs between 78 and 82.
 
<a href=showthread.php?s=&postid=13011766#post13011766 target=_blank>Originally posted</a> by HaywoodJafragit
Mine also runs between 78 and 82, the extra temp surge provided by my halides

My halides are in a coralife fixture under a wood canopy. I installed two fans on the top of the wooden canopy. Now there is only a one degree variation in temp all day.
 
Well, it depends where your animals are from. Having dived nearly all of those places, I can tell you that on a given day, the temperature will not vary very much. Over the course of a year, seasonal change will occur so dealing with average is misleading. Sure the low temperature and the high temperature in a year are significantly different. Still, I have found that stability in this hobby generally is desirable.
 
Well, it depends where your animals are from. Having dived nearly all of those places, I can tell you that on a given day, the temperature will not vary very much. Over the course of a year, seasonal change will occur so dealing with average is misleading. Sure the low temperature and the high temperature in a year are significantly different. Still, I have found that stability in this hobby generally is desirable.
I've worked in the Pacific, Red Sea, and Caribbean and the only place I've ever been that didn't change at least 5 degrees during the course of a dive was a place in Hawai'i. I've seen as much as 14 degrees change without changing depth. Several people, including myself have put temp loggers on reefs and measured minute-to-minute changes too. They vary a lot. I know Brian Helmuth has a paper comparing long-term and short-term temperature trends throughout the Caribbean at various depth. One of the major things he found was that drastic, minute-to-minute changes were frequent and often as much as half of the yearly variation.

There are also several papers that link exposure to temperature variation to increased tolerance to thermal stress.

On the other hand, there is no evidence that regular daily variations cause harm.
 
thank you greenbean
I should add that alot of greenbeans solid advice and information is on the misconceptions thread that I linked to above.

One of the other concepts IMO should be mentioned here is that we teach our fish to live in certain temp conditions(an others) that are different from the reef
For eg if we set up our tanks so there is basically no temp fluctuation and for some reason we get a large swing. Then this can affect the fish negatively.
However that is not to conclude that fish can't survive wide variations in temp like Greenbean has said there are in the water
Simply because we have adapted our fish otherwise by being in a different ecosytem.
 
<a href=showthread.php?s=&postid=13011064#post13011064 target=_blank>Originally posted</a> by singold
+1 on heater getting suck on the "on" position. Cooling new tank off now that was up to 92 degrees, heater stayed on. Cheap Wal-Mart brand for ya. Luckily, just started it, no fish or corals in it yet.

I've had one wal-mart heater that went bad, but if they work a week, they seem to run for years without trouble.

I bought a temp controller from marine and reef for less then $100. It's built to plug in to their own heating element, but I use it with a submersible. Both switches would need to fail "on" for the tank to over heat.

Although, only one switch needs to fail "off" to loose the heater. I think overheating is the primary concern.
 
Scott, how do you keep such good track of all the threads on RC? Do you put a potentially useful thread in "Favorites" when you read it or do you just remember that you read it and go searching for it when you need it? In any case, I appreciate all the good links you post on here and the time you spend helping all of us!
 
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