Hi, I just finished brewing a black IPA in my SS brewtech fermeneter. This is my first one using stainless steel, and I cleaned it heavy with TSP first like suggested. I can’t tell if the black I’m seeing in here is from grains or mold growth? I sanitized it the best I could prior to brewing and there are no off smells. I did have to pop the lid completely off a week prior to kegging so I could dry hop it. Any advice on if it’s safe?