Just Add Water (and Turtle Food)

So hen i got them they were the size of a Toonie (Canadian two-dollar coin) or a five-hundred-yen coin (in Japan). But now, four years later they are HUGE!!!! And they eat a ton! If this is what turtles are like, i`m terrified of having kids!! Eek!
Kobo is the brown one and Shotoku is the green one.

Kobo, when i first got them in 2004:


And then next to a five hundred yen coin in 2005:



And next to the same coin in 2008: