I started fermenting a 5 gallon batch of Edwort's Apfelwein on 5/15. On day two it began to overflow into the airlock. I addressed that problem already. However, today I noticed some sediment build up in the bottom of my airlock. I've read about people having issues with mold in the airlock, but I don't know if that's what this is. Should I clean it out, leave it, or something else? There's a picture attached if that helps.

