different zoas require different light/flow etc. Give them time though, like ScubaSteve said, it's not uncommon to have them stay closed for long periods of time, just so long as you don't notice them melting away. Growth rate varies as well, from what I've read anyways, and can be affected by various things such as species, feedings etc.
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75 gallon with 20 gallon sump in the works.
R. Bacchiega. Tattooer
I didn't smack you, I simply High Fived your face.
I've got so much glue on my pants it looks like a Friday night gone horribly wrong.
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