Try it. The water should be kept at about 80°F. This usually requires a small heater. BTW, turtles are not social animals and do not require company.

I have a small musk turtle in my fish tank. I want to put him in his own tank and get him another turtle for company. I have a use light for him, but I was wondering do I need the heater or will the uni light keep the water warm for him?