How big do female Stinkpot Musk Turtles get? And would two females be okay living together in a 100 gal. tank?

the record size for a stinkpot is 5.4 inches, but most never get much past 4.". two females could easily live in a tank that large. They are bottom dwellers, but might show their heads if you built a little platform a few inches below water level,as they like to burrow into the mud on lake shores.