krzyphsygy
Active member
You think so? I felt my UG to double the water volume, with all new water and sand would have made it a "new tank". Maybe I just got lucky? That and I check my params frequently.
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12 year old rock provides a tremendous amount of bacteria. Always a great idea to use rock like that. Bacteria doesn't live in the water column, but on the rock, sand, walls, etc. If you used wet live sand you also benefited from that as well. I have done this a few times with no cycle and corals right in. But some always suffer a bit, but it might be a finicky piece.