Imo, an adult softshell need pond. Indoor or outdoor(depending on where you live). Indoor ponds cheaper than aquariums. You could get a rubbermaid stock tank. For a female at least 300g. And for a male at least 200g. :I have a six inch Florida Softshell Turtle in a 33 gallon long. :How big do they get? I was thinking of getting him a 125 gallon tank. Is this big enough for an adult Florida Softshell?