You're not expecting any more yeast growth once in the secondary, so to the best of my knowledge, nutrients aren't needed. It would be a potential (though small) contamination risk, since you wouldn't be boiling them. After primary fermentation is finished, you're just wanting the yeast to clean up after themselves and then flocculate.
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Wild Cherry Cider; JAOM; Guava Orange Cider (<- wut).Aging:
Unnamed Holiday Apfelwein.Bottled:
Pliny clone. Brett cider. More 7 Stairs Pale Ale.