I don’t have experience with the marine snow method so I don’t have a comment specifically on if that method works. I’d just like to point out that it sounds like people are talking about finely ground solid calcium carbonate in this thread. Not actual marine snow, which contains many other organic and inorganic components, including a bunch of what would be food for the vermetids. Just want to make sure people aren’t accidentally feeding their vermetids and worsening the problem based on this thread’s discussion.