QUOTE(Ranchugirl @ Jul 18 2008, 07:44 PM)

They aren't really plant eaters, either, so it wouldn't supplement their diet either.
I don't understand why you'd say that.

My turtle loves to shred and eat aquatic plants as well as lettuce (not iceberg). I'm sure we have different turtles, but the forum I go to (turtletimes.com) a lot of turtle owners feed their turts plants. Some ppl have success w/ a planted turtle tank, although I haven't been that lucky. Anything you put in the tank, if you have an aquatic turtle, will become turtle food.
I suggest, chrissy_bee, that you find a turtle forum and there you can find a list of edible plants and other usefull information. Some enrichment items could be fish, although some do worry about them carrying parasites so it's your discretion. As long as there is enough water (10 gals per inch) and a basking dock of some sort w/ a UVB/UVA/Heat lamp the turtle should be fine. Turtles don't need company since they are solitary creatures.
edit: I didn't mention what type of plants, anachris is a good one. So are some pond plants like water lettuce or water hyicinth.