It is ok to add them now.
Remember snails like high and constant salinity 1.025 to 1.026and must be acclimatized very slowly. 3 hours minimum
Any questions on how to do it ask.
Sand bed. I like to natural look and I like the fact that there are lots of stuff in the sand that creates minute food for all the other critters.
But, unless it comes to tangs, each to his own.
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