Is it for the infusoria Ray? That is the only thing I can think of, that as the lettuce leaf starts to rot it produces infusoria that is good for feeding very small fry. I don't know how to transfer the infusoria to the fry, just that you are supposed to make sure you don't transfer any of the rotting material with the infusoria.
SOrry I am not more help.
Jan
SOrry I am not more help.
Jan