Personally I keep Phrynops tuberosus which was a subspecies of geoffroanus in earlier times.
A Water temperature of 27°C is not necessary all the time, they even do well at 20 - 22°C. I have talked to a guy who was in Venezuela to search for mata matas and he told me that the water in 1m depth was about 25°C.
My turtles also like to swim, but only if the light is dimmed. They are most active shortly after sunrise or when it gets dark. No UVB Light is necessary since they feed mostly on stuff like whole mice, fish or pellets. These foods already contain vitamin D3 which can be used by this species.
I have them for 1 year now and this summer I had my first clutch of 12 eggs and I hope for more to come!
by the way: Who is the breeder of the hatchlings on the fotos?
Immagine:
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