Rob - It grows everywhere, often Pisces or Aquagreen plants will have a few threads of it on them. It then multiplies like nothing else! Barring anyone having a bit spare, I can of course send you some, but someone you know is bound to be trying to get rid of it.
Lisa - Sorry I gave you that lot that time w out being explicit about its carnivorous nature
Brad - It eats everything, duckweed, birds, bats... In one tub there is just utric w a few pieces of duckweed on top, and in the other, there is a thick mat of utric covered by a dense layer of Azolla. I think that quite a nice combo. The utric seems to love it when the water level is so low that the mat is almost resting on the bottom. I throw in a little fertiliser, that seems to help produce flowers.