I do just the ice cubes for Piggley.
The blueberries and strawberry's I would stay away from , not a staple and should be rarely used. See pyramiding going on in video. To many treats ? To most fruits can be offered once a month , no more , too high in sugar ! What blueberries do for humans is different in turtles. I even heard people say they help in shedding , more a coincidence , with no scientific data.
Fruits as a last resort help when a turtle stops eating due to a problem just to get something in to keep them going. But it's not a natural food a slider would encounter in the wild.
Carrots would be better , with limited usage , has a nutritional value but carrots can be harmful if excessive.
Good read :
http://www.redearslider.com/It is great to see them playing with ice cubes ! That never get's old.
Not trying to take anything from what you doing ,that's your call , it's just some info please do not take it wrong. Doing this 50 plus years successfully and still new on this forum. I'm old school and that has always work of me. If not for Hurricane Katrina 2005 my guys and girls would be in there 40's today. Lots older now and with my health it's just Piggley and me!