Is temperature a chemistry topic?

[ultimatemj]

I know it affects the measurements of various chemicals, but I'm wondering about it in terms of 'stability'.

When folks talk about stability being key to coral husbandry, what range of variability is considered stabile?

Here's my temp chart from today.

As I look at it I'm wondering is the 1deg range a good target? Is the rate of change ok? Thinking my heater might be too big.

Is there a point where the rate of change become as, or more important than the total range of temp?

Curious to hear your thoughts~

Thanks!

 

[Randy Holmes-Farley]

Well, I discuss temperature in my chemistry parameters article, so it must be chemistry.

https://www.reef2reef.com/forums/re...-coral-reef-aquarium-randy-holmes-farley.html

Overall, your temperature swing is perfectly fine (see last paragraph of the section below from the article).

from it:
Temperature

Temperature impacts reef aquarium inhabitants in a variety of ways. First and foremost, the animals' metabolic rates rise as temperature rises. They may consequently use or produce more oxygen, carbon dioxide, nutrients, calcium, and alkalinity at higher temperatures. This higher metabolic rate can also increase both their growth rate and waste production at higher temperatures.

Another important impact of temperature is on the chemical aspects of the aquarium. The solubility of dissolved gases such as oxygen and carbon dioxide, for example, change with temperature. Oxygen, in particular, can be a concern because it is less soluble at higher temperature.

So what does this imply for aquarists?

In most instances, trying to match the natural environment in a reef aquarium is a worthy goal. Temperature may, however, be a parameter that requires accounting for the practical considerations of a small closed system that might suffer a power failure and trap the organisms in a small amount of poorly aerated water, something that rarely happens on a natural reef. Looking to the ocean as a guide for setting temperatures in reef aquaria may also present complications because corals grow well in such a wide range of temperatures. The greatest variety of corals, however, are found in water whose average temperature is about 83-86° F.
During normal functioning of a reef aquarium, the oxygen level and the metabolic rate of the aquarium inhabitants are not often important issues, and many reef tanks do well with temperatures in the low to mid 80's. During a crisis such as a power failure, however, the dissolved oxygen can be rapidly used up. Lower temperatures not only allow a higher oxygen level before an emergency, but will also slow the consumption of that oxygen by slowing the metabolism of the aquarium's inhabitants. The production of ammonia as organisms begin to die may also be slower at lower temperatures. For reasons such as this, one may choose to strike a practical balance between temperatures that are too high (even if corals normally thrive in the ocean at those temperatures), and those that are too low.

These natural guidelines leave a fairly wide range of acceptable temperatures. I keep my aquarium at about 80-81° F year-round. I am actually more inclined to keep the aquarium cooler in the summer, when a power failure would most likely warm the aquarium, and higher in winter, when a power failure would most likely cool it. All things considered, I recommend temperatures in the range of 76-83° F unless there is a very clear reason to keep it outside that range.

One additional comment on temperatures: having a small temperature swing is not necessarily undesirable. While temperature stability may sound like a desirable attribute, and in some cases it may be, studies have shown that organisms that are acclimated to daily temperature swings become more able to deal with unexpected temperature excursions. So while a tank creature that normally experiences only 80° F may be very healthy, the same organism adapted to a range from 78° F to 82° F may be better able to deal with an aquarium that accidentally rises to 86° F

 

[ultimatemj]

My bad for not looking hard enough for that...

Only question not answered is rate of change. Does it matter at all if you raise a degree in a minute or two vs say, an hour or so?

Thks for the quick response!

 

[Randy Holmes-Farley]

A minute would be too fast, IMO, but I don't think it is possible to do that unless it is a really tiny tank.

How big is the heater you have?

 

[ultimatemj]

Finnex Deluxe Titanium 300W.
Fairly sure it's not the 500...need to verify.

Sump is in (cool) basement with ~20g water volume
Display in family room with ~40g water volume.

Thinking of switching to 2 heaters for backup when one fails...which would shift me to maybe two 100w of another model since the finnex titanium smallest is 300w

 

[Randy Holmes-Farley]

The smaller heaters are probably a good idea from a backup perspective. I use a bunch of heaters on a temperature controller, and a few more not on the controller in the winter.

From the temperature plot you show, I think even the 300 is OK, but is overkill under at least the current conditions.