Minimal winter temperature for lesser and dwarf sirens?

[herve]

Dear Sirens growers, according to your experience and knowledge, what minimal temperature of the water would you advise for lesser (S.i.nettingi) and for dwarf (Pseudobranchus sp) sirens, during winter time, let's say for 2 months: 10,12,15C or more or less?
Thanks.

 

[pierson_hill]

I think any temperature between 5-15 C would be low enough to simulate winter conditions for both species. I have kept both in outdoor tanks in north Florida where it reaches below freezing on occasion.