Do you heat your ATO tank?

Discussion in 'Equipment' started by Jeff Rehling, Jul 12, 2018 at 6:59 PM.

  1. Jeff Rehling

    Jeff Rehling Supporting Member

    I have a 10 gallon fish tank i'm using for my ATO reservoir. Should I have a small heater in there?
  2. Coral reefer

    Coral reefer President

  3. NelsonCh

    NelsonCh Supporting Member

    I dont have a heater in my ATO but I do have a heater in my refugium and display.

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  4. daddio

    daddio Supporting Member

    You wont add enough top off water to your reef at any one time to impact temp.
    Cheers! Mark
  5. sfsuphysics

    sfsuphysics Supporting Member

    Here's an interesting way of looking at things, you can ...

    1) put a heater in your ATO, pay for the electricity to heat that amount of water, the water loses energy to the environment, you continue to heat and fight a losing battle against thermodynamics

    2) don't put a heater in your ATO, the water goes into your display, you heat the water as it's needed, still lose the battle against thermodynamics but you're only on the hook for keeping one body of water at reef temperatures.

    Now if you were going to do a sizable water change, then sure heat that water, but for ATO don't bother.
  6. xcaret

    xcaret Supporting Member

    Not for top-off water but if you mix your own salt, you could the day before, bring it to about the same temp as the tank but only for a big water change.
  7. insomniac2k2

    insomniac2k2 Supporting Member

    I look forward to my ATO water cooling my tank down after evaporation. Would never want to heat it.
  8. rygh

    rygh Supporting Member

  9. kinetic

    kinetic Webmaster

    Wait, you guys don't heat your water change water? o_O

    Not to derail the discussion, though I think the answer is clear by now, but I've always heated my water change water. I always assumed mixing / salinity measurements were best done at the same temp as the display.
  10. rygh

    rygh Supporting Member

    Nahhh. It is the bay area. No big temp difference.
  11. Coral reefer

    Coral reefer President

    Nope. My tank drops about 3-4 degrees when I change 100 gal
  12. Gablami

    Gablami Supporting Member

    I feel as you do. I don’t want my salinity to change at all when I change larger quantities of water, and salinity measures differ with temperature. So I bring my mixed water to 78, and make sure the salinity matches my tank before initiating the change. I guess some might trust temperature correction more than I do...but I like to double check salinity at the same temp.

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  13. RandyC

    RandyC Supporting Member

    I don't either. A lot salt mix instructions usually say not to heat during mixing as heat can encourage precipitation to occur. I think Red Sea says something about using water in the high 60s and Fritz says 70.

    You're supposed to heat just before using if you do want it to match tank water temp.
    Coral reefer likes this.
  14. rygh

    rygh Supporting Member

    If you use a refractomer, it is not really doing what you think.
    The few drops you add to the refractomer to measure, very quickly change temperature to that of the refractomer.
    That is important and required.
    The temperature compensation is based on the refractomer temp, not the water temp.
    So for salinity measurement, water temp does not matter.
    Gablami likes this.
  15. 650-IS350

    650-IS350 Supporting Member

    Nope never heart ato water ever

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  16. Flagg37

    Flagg37 Colorado member

    When I had my 30 gallon tank I would heat up water in a pot on the stove since it was much faster and cheaper than using an electric heater. When I upgraded to the 120 I pretty much stopped doing water changes.
  17. xcaret

    xcaret Supporting Member

    For those using an internal pump to mix water the heat generated helps a bit so fish and corals don’t feel a “cold shower”
    Danner Mag pumps are excellent source of heat for water mixing; specially the 9 and 12
  18. NanoCrazed

    NanoCrazed Supporting Member

    ATO = no. Negligible amount of water added to primary at any given time to have negative effect.

    Water changes = absolutely yes. Don't shock the inhabitants

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