Usually 15-20 C is the preferred range. I could never keep them successfully
outside a frig here in Brisbane. Most people here that successfully culture
them all the time keep them in refrigerators. I have tried keeping them
outside a frig and at first I would get a massive growth but then the
culture would just slow right down. Also you have to keep the culture moist
all the time otherwise it will dry out.
Ron Turner in Melbourne use to breed stacks of worms in open topped stryo
veggie boxes stacked on top of each other in his garage all year. One thing
you have to watch out for though if you don't keep them in a frig is ants -
they will terrorise the cultures. Ron use to maintained his boxes over water
to keep the ants away.
Adrian.
Adrian R. Tappin
"Home of the Rainbowfish"
http://www.ecn.net.au/~atappin/home.htm