I have a vinyl coated mesh cage (about 18"x18"x 24" with 1/2" holes) that I have used to hold crawdads for the last 3 or 4 years. It stayed in the pond from April to September each year and has held up incredibly well, no signs of rusting away anytime soon. This stuff is pretty stiff and no way of rolling it up in it's flat form...it's a heavier gage wire at any rate. If you could find it in a smaller hole size, it would be my choice for a minnow cage. I would make a round, obround, or squarish with rounded corners coral with a flat bottom and add stiffener bars (think light rebar) if needed. Something like this shouldn't be too difficult to brush off with a broom to keep it clear in case the FA was a problem. The roundness of a coral would help keep the fish from fighting a corner while looking to get out. I used hog rings to hold the panels together on my small cage.
