They should be fine floating for two days. Do they come in a pot? If they do, you can leave it as is and not remove the rock wool.My plants got here way before expected.
I didnt get the notification and they were sitting in my mailbox for 2 days. All but one look really healthy.
The problem is I havent bought the sand yet, and wont be able to for another day or 2.... I put them in a bucket of dechlorinate water. Will they be fine in that?
I'll post a pic of the unhealthy plant