So far I've been at this for 3 months or so. I started with a brick of coir and have been adding food regularly. I never added more bedding and keep adding more food. Worms seem to be doing great as they keep multiplying and I see a ton of eggs. Do I ever need to add bedding or can I just keep adding food? I'm also having a hard time telling the difference between castings and coir, they look almost the same.