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I would add 1mL of Vodka (40% ABV / 80% proof) or 5mL of vinegar per 100L tank volume to provide some carbon and if phosphate is undetectable it could help adding 0.02ppm or so as well: https://www.reef2reef.com/threads/diy-phosphate-dosing-recipe.1109919/
It's optional but can speed up the process in case carbon or phosphate are limiting.
It's optional but can speed up the process in case carbon or phosphate are limiting.

