The turtle has to be in the water to eat and defecate. The need twice the amount of water to swim as their size if they are 4" the turtle needs 8 inches of water to swim in. As far as a UVB bulb I was asking if it is a 5.0 or 8.0 they sold you. Turtles need a Reptisun 10.0. 3/4 of their diet should worms or canned cat food and the other 1/4 should be leafy greens.No lettuce ony romaine or endives. Iceberg lettuce contains no nutrition. They als need to be getting a calcium supplement on their food and have a cuttle bone or calcium block in the tank.
It is not unusal for a turtle to take time to adapt, but since it has been a week there may be something going on that the turtle will not swim. I would try putting some meal worms in the tanl and see if he will swim for them. It may take something like worms to entice the turtle to eat.
I am going to give you a detailed care sheet. I would say if the turtle is not eating and defecating by Monday to take that one back and see if they have one that is more acclimated and eating. It is coming into winter season, and turtles do slow down, but by now the turtle should want to eat something and swim. This is the care sheet. Please read it over and and let me know if you have any questions and we can discuss them.
PAINTED TURTLE CARE SHEET
Well-cared for painted turtles can live 30 years or more.
It's recommended that a baby have at least a 15 gallon tank. By the time the turtle is 3-4 years old, it will need a 60 gallon tank, so it's best to get the biggest you can in the beginning. You can also use a large RubberMaid tote. That's not as pretty as a tank, but costs a lot less. Set up the tank so there's a land area and a water area. Put the basking light at one end so the whole tank doesn’t get too hot. You want the water to be about twice as deep as the turtle is long. If the turtle is two inches long, you'll want four inches of water.
Temperatures and Basking Area
Turtles need certain types of lighting and need to be warm. Air and water that are not warm enough can lead to fungal and respiratory infections and unhealthy shells. Turtles must have a basking area where they can get out of the water, dry off, and bask in very warm light. The ambient air temperature in the tank should be around 80*F, with the basking area warmer still. Over the basking area there should be some sort of lamp that will take a 40-60 watt incandescent bulb (or you can buy a ceramic light fixture made just for reptiles). If you live in an area that has farm stores, you can buy a metal light fixture made to keep baby chicks warm for just a few dollars. Don't buy the accompanying bulb, however. You need an ordinary incandescent bulb in the basking light. Hardware stores sell similar fixtures as work lights. The basking area should be kept at 88-92*F. Use a digital probe thermometer to be sure. You can adjust the temperature by raising or lowering the light fixture.The lights that come with the covers on aquariums are not suitable for turtles. You'll also need a submersible aquarium heater that will keep the water in the low 70’s.
It's extremely important that you buy an additional light that produces UVB rays. A Reptisun 10.0 in the straight tube style is a good brand that does. If you choose another brand be absolutely certain it provides UVB rays. Don't take the word of pet store personnel, but read it for yourself. Full-spectrum, DayGlo, SunGlo, UV, or UVA are not the same thing. I'm putting a lot of emphasis on this because it's crucial to your turtle's health. Without this light, Metabolic Bone Disease (MBD) will develop because your turtle won't be able to produce vitamin D. Vitamin supplements are not a good replacement for the proper lighting. MBD causes a very slow and painful death.UVB bulbs must be replaced every six months as they lose their effectiveness after that, even though they may still look fine. Light that comes through a window isn't sufficient because the glass filters out most of the rays turtles need to stay healthy. To prevent MBD, turtles also need calcium. The easiest way to provide it is to place a cuttlebone in the tank. Cuttlebones are sold in bird departments of pet stores.
Turtles are very sensitive to water quality. Even if you change the water every day, it can still contain harmful chemicals. A good filtration system is essential. Water changes are also needed even with a filter. If the tank is too small, no filter can keep up with the amount of waste that turtles produce.
Feeding is an area where pet stores often give out bad information. Commercial food and animal products (meat, earthworms, canned cat food) should make up about 3/4 of the diet. The remaining 1/4 should be plant foods (dark lettuce like romaine, bits of strawberry or melon, etc.) Hatchlings should be fed every day. Older turtles should be fed 3 times per week. Overfeeding can lead to gout and kidney failure.