Hi guys I’m upgrading from a 6 feet tank to a 9 feet tank. I’ll b using all of my old rocks but not the sand. And some filter media and old water too. Question is with 60-70 pct new water. Will this cause a big cycle?
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Highly unlikely.Will this cause a big cycle?
Hi guys I’m upgrading from a 6 feet tank to a 9 feet tank. I’ll b using all of my old rocks but not the sand. And some filter media and old water too. Question is with 60-70 pct new water. Will this cause a big cycle?
Agreed. Sand doesn't hold a significant percentage of nitrifying bacteria as compared to the rock. And water, while having some free floating bacteria is even less significant (WAY less).Highly unlikely.

