David good job with the Calvus. Not sure about when to take out the shell but I am interested in one of those fry unless you plan to keep them.. Thanks Paul PS the I got 4 fry from the first swallowtail that was holding and I have another holding now. I had to take the male out of the tank to give the females a break. The other male you gave me I took out of the main tank and put him in with the females to get him to color up.