Good idea, take the frozen rock and put it into the spare tank. You could run the heat of the tank in the 70's. There will probably be some dieoff due to the fact that the rock as frozen, so by using the spare tank it will not affect your current tanks water parameters. Give it a bit then use some seed rock (rock that currently has organisms growing on it -sounds like you have some in a 10 g tank-). The seed rock will allow for organisms to populate over to the other rocks.
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RSM 250. Clownfish, Fox face, Blue tang, Yellow tang, Kole tang, Clown tang, Coral beauty angel, French Angel, splendid dottyback. CUC, softies, lps, sps.
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