Tropical Fish Keeping - Aquarium fish care and resources

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KSASTER2 04-21-2010 07:52 AM

Temp drop
During my weekly water change this morning, I accidently added colder water to my tank than i normally do. Temp went from a steady and always constant 78 to 74. Will a sudden 4 degree drop cause any harm? Tank has neons, guppies, albino corys,and a cpo. My pregnant guppy did drop her fry right after I finished the water change.


JohnnyD44 04-21-2010 08:05 AM

If your tank has a heater, it'll bring the temp up with in a few hours I would imagine..

KSASTER2 04-21-2010 08:08 AM

yeh i have a marineland stealth pro heater 150w its a 29g

JohnnyD44 04-21-2010 09:29 AM

how long after you added the new water did you check the temp...i'm sure it's corrected itself by now..

KSASTER2 04-21-2010 09:57 AM

I immediatly checked the temp right after the water change. 2hrs later it's at 77 so almost back to normal.

JohnnyD44 04-21-2010 11:35 AM

see, i told you nothing to sweat!! you'll be fine.

aunt kymmie 04-21-2010 11:40 AM

I've had a few mishaps (due to being a complete and total knucklehead on my part) where my water went from 78 to 88, and once from 78 to 70. I didn't lose fish but I wonder what those extreme flucuations are going to do to their eventual lifespans. A four degree temp change wouldn't cause me concern and I'm sure there will be no long term adverse affect on your fish. :)

Byron 04-21-2010 12:31 PM

Kymmie's is quite right, a minor temp change of a few degrees is not a problem for most fish species. Some such as the rarer gourami (Chocolates, etc) could have problems; but the fish you mentioned are accustomed to this in their natural habitats.

The heavy rains that fall in tropical forests always cool the water by a few degrees, and this can stimulate egglaying fish into spawning. Their instinct tells them to spawn at the start of the rainy season, so if you do a water change with slightly cooler water, and do it on an overcast day (low pressure system), it will initiate spawning with many tropical forest fish like characins, corydoras, etc.

I also deliberately reduce the temp a degree or two in my Amazonian tanks; never in the Asian tank though because of the gourami.


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