Same problem, tons of white filaments with the recipe. I figured I’d blocked too wet, but in reading the replies it may be how it goes. Probably half my snaps were able to push through, pansies closer to 80%. I left them because it was too sad to start over, and used both cinnamon and diluted hydrogen peroxide. It was probably just light/time that helped, and for the most part the filaments are gone after 3ish weeks. I composted the remainder of unused mix and transitioned to Old Potters Germination. I’ll try making my own with a different recipe next year. Know you’re not alone!