I did the same thing as Tang Salad, only I cupped the clowns and "forced" them to swim into a nem. (forgot about this way). they took to it almost immediately. When it was dark, and they swim sideways at the top of the tank, almost "intoxicated" like, cup or "catch" them, shine a light on the nem, and "force" them to swim in it. It was a gentle coax, and they stayed there all night, and day there after. Good luck.