February 17, 2013
I just set up two new tanks that are conjoined by an external filter and some kind of waterfall-construct, one containing 90L with a strong current and a hillstream-like layout, the other one with 110L is rather sluggish.
Anyway, those tanks both do not have a lid, so putting in a heater would be a waste of energy, and as I do not like heating my apartment over 20°C in the winter, the water temperature can drop as low as 18 to 17°C (I think that should be about 62-64°F) for at least two months of the year - maybe even for 4 months.
I know that the recommended temperature for Corydoras pygmaeus als well as for Aplocheilichthys normani is above 20°C. On the other hand, the recommended temperature for pangio kuhlii is approximately 24°C and they have been doing very well in my unheated and unlit quarantine-tank this winter.
So I would really like to know if you have made any experience with corydoras, Aplocheilichthys or similar species in cooler water and if you think that I should risk trying it out or not.
Greetings from Austria (: (I hope you can understand my weird english, this is obviously not my native language)
July 24, 2010
Some of the more southerly Callichthyids do well at lower temperatures.
As well as the common Corydoras paleatus you might also try C. longipinnis, C. diphyes, C. undulatus and C. carlae. I've kept all these species and they will be fine at the temperatures you give. Some Aspidoras and Scleromystax are good at lower temperatures too.
May 15, 2014
Many of the corydoras species actually spawn in cooler waters so it is part of their natural life cycle and temperatures between 20-22 are used to initiate spawning. Also, fry and juvenile cories do better in cooler water that is around these temperatures. Panda cories (which actually prefer cooler waters) can be kept at those temperatures.
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