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my turtle is about 4 inces a little less how deep shoould my water be?

As deep as your tank without your turtle being able to escape. You should have at minimum a 40 gallon right now, and a 40 gallon long is 13", so you can fill it right to the top. If he's in a bigger tank, that's fine too. If you're worried about him having to swim to get to the top, you can put resting areas such as large fake plants or underwater platforms.

Cain, it's not necessary to make multiple posts. Just ask your questions in one post.

You need to get a bigger tank, and the rule for filling up any tank is exactly what bulldog said.

Think of your turtle as a fish that needs a dock to dry off on. They need an aquarium nearly full of water (maybe 3-4" from the top). Like has been said though in the other posts - you need to fill the tank, get a basking dock (you can use the old one - just clean the algae off) and to get appropriate lighting to provide a warm basking area and UV rays. If you cant afford the vet - at the very least do these things. It seems you have a sick little one.

Where are you at - maybe someone knows of a vet in the area?

so i put in a ghetto [---] folgers container as a basking dock with a 100 watt bulb and what should i feed her instead of pellets

Fill it up as high as you can without the turtle getting out.

I know this is cain's topic,but I have two turtles who are about 2",and I have a 10 gal. tank.Is that big enough?

TurtleLover - No, it's not big enough. It's not even close. 2 x 2" turtles need between 30-40 gallons of water, and eventually they'll need between 150-200 gallons, assuming they can remain together.

By the end of their first year, they should both be about 4", at which time growth will slow. That means you'll need a 60-80 gallon tank. I'd start looking into that range of tanks now so you can find one as soon as possible and it will last for a little while. Otherwise, start looking for bigger tanks. But remember, you may have to separate them, so going for the 200 gallon tank right now might be premature.

Well,money's tight right now,so my parents won't buy one,so I guess I'm gonna have to start saving everything I have,and it's gonna be hard consdiering I don't get an allowance either.

You can use a large rubbermaid container in place of a tank. You can usually get like a 40-50 gallon one for 10 or 15 bucks. One consideration, though, is you'll need to check daily for leaks and replace the container if it becomes damaged. (You don't want to soak the floor!)