I'd check your FG after the 15 day primary to make sure it's finished, and check for diacetyl. You might want to warm it up to the 65-70F range at the end of primary to clean up diacetyl if it is present. Depending on your yeast it may or may not be there. I wouldn't pull it off the yeast until you're sure it's done fermenting and diacetyl is cleaned up.
1° - Simple Cider (2/15/2014)
2° - Nuthin
Aging in a wine barrel - En PerpetuumSolera (1/23/2011)
Kegs - May the Schwarz-Bier with you (2/9/2014) Cream of Three Crops Cream Ale (2/15/2014) Test Depth American Stout (8/29/2013), Big Red Imperial Red IPA (1/19/2014), Ed Wort's Apfelwein (late 2012)
My brew rig is pretty much done :)
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