Thanks jtay, Kurt. I think i will look for the well known brand (Fluker's) that you suggested jtay. The JurassiCal was one that i saw on trade me so may not be what it should be. Thanks for your help.

Oh Kurt, about the freezing flies... I have a fly catcher and if i put the fly catcher in the freezer for a minute it sends the flies to sleep for a short time so i can shake them out and sort the sizing for my frogs. It works really well and when they wake up they are in the enclosure and start flying around. It works with most insects.