One form of temporary FHM minnow spawn substrate. Instead of pieces of waxed cardboard look to see if you can find some used agricultural seed signs - plastic cardboard - and durable. The grain elevators or seed salesmen often have lots of that stuff they throw away. I get a lot of it for a little coffee money donation at the local grain elevator.
Last edited by Bill Cody; 03/25/1710:14 AM. Reason: video link