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Most of the time snails don't bother with it. If they get hungry enough as in a lack of their preferred foods Astraea will munch on it. 99% that turbo won't though.
Sweet. You may be unlucky and find that the snails do too. This hobby is fun like that there is an exception to every rule. I've heard people say that their tangs eat it as well. I have a blue hippo and a yellow tang. I put some in my display and it is still there they won't touch it.
That it does. Super quick. And it's not messy at all. Really stays together well. I left it in the display and just tear some off to keep smallish bushes if you will. Just in case I get stuck out of town I figure the tangs will eat it rather than starve to death. I hope.