Millepora, easy or hard?

[Aquattro]

I'd say pretty easy, no tougher than any other acropora.

[Myka]

I would say Milles aren't as easy as Birdnests or Montis, but taking SPS as a whole, Milles aren't even close to be a challenging genus. It's a good next step considering the SPS you listed success with. It could be that you simply picked a poor specimen for your first try with Mille.

[reefermadness]

I agree with these guys. Im not sure what millepora you tried but I would recommend trying a frag from one that is already flourishing in captivity for a long time.