turtle with the help of the heater?

I have two baby turtles resolution. I have a heater for them and not put me in because I was afraid to burn. Constantly go on top of him and try to pass under it. Here's a video. http://www.youtube.com/watch?v=BGeBuURWm-U This is the heater. http://www.petco.com/product/13811/ -Marineland Visi-Therm Stealth-submersible-Aquarium-Heaters.aspx "I think it is. I have came with the tank comes with filter and light 2, tank, plant, and rock. It was a setting for turtles. Zoo Med think it was left filter became very hard, IDK what is wrong with him

they will not burn because they are in the water but do not put too high because they do not want to boil the water. (May!)

Oceanic Biocube 14