Board index Aquaria Topics Fish Health and Water Chemistry Temperature fluctuations, safe or not?

Temperature fluctuations, safe or not?

Discussion about fish health and water chemistry.

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Post Wed Jul 11, 2018 12:34 pm
EricV Level 1 Member
Level 1 Member

Posts: 10

During the day my temperature stays around 78-80 and at night it drops down to 73-75. I was wondering if this is safe for my peacocks and haps or should I add a 2nd heater?

Post Wed Jul 11, 2018 12:57 pm
JKhang Level 3 Member
Level 3 Member

Posts: 93
Location: St. Paul
I run heaters all year long to try to avoid fluctuations. How big is your tank?

Passionfish Level 20 Member
Level 20 Member

Posts: 12023
Location: apple valley, mn
Key to this question is how the period of time for the temperature to move from 73 degrees F to 80 degrees F. It the temperature change occurs slowly, the fish will tolerate. If the temperature change is quick, fish may die.

An extreme example is a tank at 82 degrees, remove 90% of water then refill with 65-degree water over 60 minutes. I would expect all fry to die as their body mass is small and thus internal temperature changes occur rapidly. Adults over 5" with larger body mass would likely survive. This presumes water is well aerated during refill and there are objects like rocks in the tank which change temperature slowly.
Like a complete unknown

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