Does anyone know if this is a Millie or Tenuis? Thanks
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Neither...looks more like a vermiculata to me...Divers Den has not been very good about their IDs for the last few years... Seems like it got worse after they change their suppliers a couple years ago... It's hard to tell for sure what it is at the stage it's at you will need to wait a few months when you start to see the new growth.

