"翻缸" means to start everything over again. Of course, you can keep the old soil if they're still in good condition but this is not recommended. Think about that soil layer can last only for 1 year (for ADA II) and at most 2 years (ADA I). If your old sand is already there for 1 year, I don't see a point why you have to keep them which can only last for other few months. 翻缸 is a very difficult/ time consuming process. Just throw them away.
_________________ 24"x12"x14" w/ Eheim 2026+Arctica Mini GLO T5HO 24Wx2 Lighting: 12:00pm-9:00pm CO2: 2+ bubbles/sec ADA Amazonia New
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