Adapting Fluval Edge For Razor Back Musk Turtle?

A 40 gallon breeder is about as small of a tank as you want to have for a Musk. They're actually very active turtles and they'll take advantage of all the space you can give them.
 
Really? Thats really bad . . . The Tanks were like £100 / $175 and then they expect you to buy a bigger tank later.
I doubt they are really even considering you buying a bigger tank later. The fact that things like this: http://www.tunghu.com/images/accessories_turtle_bowl_TB-L.png exist and are marketed for turtles tells me that some people just don't care.

I currently have a young musk turtle in a 20 long, and depending what my money situation is in the next year or two, he will be upgraded to either some bigger tub or a paludarium I've been thinking about trying out in a 75 or 90 gallon

 
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