mini aquatic turtles

Question
I have to mini aquatic turtles and I am about 90% sure they are ill. Their
shells a soft and cracking. I have tried calcium cream and fresh shrimp
yet still no change. They stay in a dark part of the tank and hardly move
now. I'm afraid they may die...any advice?  

Answer
OK Shari, to put it bluntly there are no such animals.  mini aquatic turtles do not exist.  Most likely what you have are baby red eared slider turtles.  that being the case follow this link which is on Red Eared Sliders it can be used for most aquatic turtles http://www.associatedcontent.com/article/2887890/prescription_for_red_eared_slid...
let me know if this doesn't answer all your questions.