Posted: Mon Jan 21, 2008 2:24 am
An occasional temp dip into the 60s at night with daytime temps in the 70s is ok but when it gets down there regularly you'd better bring them in. Their immune system will be weakened in cool weather and, if it gets much cooler, their digestive systems will cease to function and any food any their gut could spoil, killing them. In nature they will begin hibernating when it gets cold but they can't do that in a kiddy pool - conditions aren't right at all.
Get a rubbermaid tub for them to stay in when they come inside. I got a 50 gallon tub from Lowes for $18. Outfit it with a water heater, light fixtures and a basking area. If they will be staying outside most of the time you can probably manage with just a heat lamp over the basking platform.
How long have you had these turtles?
SpotsMama