Posted: Wed Jul 13, 2005 1:30 pm
Welcome to the site. The only bulb will do that is a combination UVB mercury vapor bulb, but you could not use it with a 5.5 gallon tank because the intense heat it gives off would cook your turtles.
The size of your tank is too small for one hatchling, let alone two. If their shell lengths are each 1 inch, they need at least a 20-gallon (the guide is to allow ten gallons of tank per inch of shell length).
They need UVB rays and a heat source (two lights if you use a regular UVB bulb, the one mentioned above if you have a 50-gallon or larger tank) and you're not going to be able to provide it with the set-up they've currently got.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-