When you are breaking down the tank anyways just take out all decor and drain water so they have just enough to stay upright.
In a setup tank use two nets, one very large and one about 3-4", both with long handles. Get them into a corner using both nets then hold the large net up against the glass and bottom along the front. Then gently chase them into it with the smaller net. It is amazing how quickly and stress-free you can catch them with this method. I even did it blind (in a sump I couldn't see in).