Am soaking a batch of grain today for grain spawn bags tomorrow, this usually goes well for me. My question is about sub bag prep. Using Mushroom Media Online, do I need to supplement the FF mix? Also using the straw pellets so same ? with those. Have B Oyster LC for this batch but have grown blue before also pink and many others trying to find what grows best. After joining skool and reading, finding things that I'm doing wrong. Putting up a grow tent today to solve my grow rm problem, do have tent for spawn. Thanks Michael for sharing all that you know with us

Hydrogen peroxide (H₂O₂) can be useful in mushroom cultivation — but only in very specific, controlled applications. It is not a general-purpose sterilizer for colonized substrate. Used correctly, it can reduce contamination pressure and improve workflow hygiene. Below is a structured breakdown from a substrate and cultivation systems perspective. 1️⃣ How H₂O₂ Works in Mycology Hydrogen peroxide breaks down into: H₂O₂ → H₂O + O₂ (water + oxygen) It kills or damages: - Bacteria - Many mold spores - Yeasts However: - Actively growing mushroom mycelium produces catalase, which breaks down peroxide. - Spores do NOT have strong catalase protection → vulnerable. - Dormant contaminants are more sensitive than established mycelium. This is why timing matters. 2️⃣ Practical Uses in Cultivation A) Surface & Equipment Sanitation Best use case. 3% H₂O₂ (standard pharmacy solution) can be used to: - Wipe tools - Clean work surfaces - Treat gloves during sterile work - Mist inside still air boxes ✔ Leaves no residue✔ Breaks down naturally✔ Mild compared to bleach B) Spore Germination Work (Agar Use) Low concentrations (0.1–0.3%) can be added to agar media to: - Suppress bacterial contamination - Allow mushroom spores to germinate - Improve success rate when working non-sterile ⚠️ Only useful at inoculation stage — once contaminants establish, peroxide won’t fix it. C) Soaking Fresh Substrates (Limited Use) Sometimes used in: - Straw pasteurization assistance - Short soak treatments to reduce surface mold spores Typical approach: - 0.1–0.3% final concentration - 30–60 minute exposure However: 🚫 It does NOT replace proper pasteurization🚫 It does NOT penetrate dense substrates🚫 It breaks down quickly in organic matter D) Treating Casing Layers Very dilute solution (0.1–0.2%) may: - Reduce surface mold on casing - Lower bacterial blotch risk But: - Overuse damages hyphae tips - Repeated application reduces pinning potential