1, use two little fishies revive coral cleaner i like this stuff .2 put plug in sand, just anuff to hold up coral. This will give yourself some time to place the coral in the right place in tank, may take
a week, unless you know the best place for it.
3, on frogspawn you can take the plug off but on other coral like zoa you can let them grow off the plug and then move to another place in tank or sell them. Hope this helps.