I'm new to here and to having turtles. Someone didn't want their turtles any more so I took them. "Spongebob" is 2 1/2 inches and "Tuck" is 2 inches long. (My 4 year old daughter named them.) I also have 125 gallon tank with Saltwater fish and a 10 gallon with 1 gold fish. We have an old 90 gallon that we will be setting up for the res. I can't wait to show pictures once it's done! Right now we are using a 10 gallon, but that's small for both of them.