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I'll second that: feed coral well, and you can see on the photos above on what kinds of surfaces they settled in my tanks. But: I have well-fed tanks with nitrates and phosphates, the LR is covered by green film of microalgae. May be give them some rock, covered by organics?
And 15 min is, probably, enough. In 3-4 months you may see the new corals. If your colony is small, they may need time to grow the bigger colony (wild guess, my colony was reasonably big at purchase). Again, feeding helps.
Good luck!
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