Mead Making Progress - Stuck Fermentation

Well it appears my fermentation is stuck. The SG is not falling and its barely bubbling. I did managed to get some bubbling by agitating it and giving it some air. Hopefully it kicks in, I will measure the SG tonight and see what the deal is. I suspect acidity might be a tad high, either that or preservatives in the cider might be stopping the yeast from replicating.