I have seen what you refer to as Kahm in my ferment when it has been covered with water. Either way, I consider it to be harmless, and part of the natural flora that makes up my SCOBY. SCOBY IMO does not always take the form that you show. It depends on where it is growing, and if it exists as it's own "jellyfish like" clump or is integrated through the culture material. Still, imo semantics. You can call it a TOmato, I'll call it a toMATO.