You would really "need" to bring home about 50% of the old water at the most. When I converted my fish room into my 220g, I made about 150g of new water & added in about 100g of the old water from the various tanks. That worked no problem at all. Even moved my seahorses/corals/fish in within a very short time afterwards.
Think of it as doing a big water change.
PM sent about some containers.
Anthony
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