So it hit -14 last night, and we have been burning a lot of oak wood. At night the air intake is closed, so by morning the glass is black. We then use the coals to fire it up hot, and it burns off just fine... Just noticed today, however, that there are dark poopy colored icicles hanging off the chimney and roof. First wood-stove winter for me, so I don't know, are these creosote stalactites normal? They don't look to be hurting anything except making my neighbor's eye's sore, but just thought I should ask, just in case. Thanks.