Apfelwein. Possible infection?

[Citrus]

So I have started my first carboy of apfelwein, using Edwort's recipe, except for using cane sugar instead, as Safeway didn't have any corn sugar....

It has been about a week and there are bubbles and all of that, but some of the bubbles are brownish. Could this be bad or am I just neurotic? There are also more bubbles than it was said there would be using the Monrachet yeast.

 

[Yooper]

Sounds fine! There are plenty of bubbles, but not usually a big lasting krausen like beer.

 

[Citrus]

Also, I haven't really been seeing my airlock activity, not that i sit and starre at it. i know when i squeeze a bit on the bottle it does send a bubble up, so im assuming its not leaky.