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Openai/6957b7f1-7b1c-8001-afad-2fc4124c1caa
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===== 對 HC 來說,什麼叫「低氮還能活」? ===== 在你這種高光+CO₂缸,HC 比較安全的 NO₃ 範圍是: * NO₃ 5–10 ppm:最穩(你現在就在這裡) * NO₃ 3–5 ppm:可活但會變挑(CO₂/流量要很穩) * NO₃ <3 ppm:風險明顯上升(很容易融、卡、長藻) * NO₃ ≈0:不建議(HC 常直接崩) 所以你想要紅草發色,不需要把 NO₃ 壓到極低;你現在的 NO₃ 5–10其實已經屬於「偏低、但不危險」的區間,對紅草上色已經有幫助了,剩下更關鍵的是:光強/CO₂穩定/微量供應。
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