Live sand in a plastic bag?

In article , Pszemol wrote:

What is it exactly? How much life could survive in a sealed bag?

Real live sand can not survive in a sealed bag.

Are there only anaerobic bacteria?

It is only bacteria, and probably only aerobic. The promotional
materical says that it speeds up the initial cycle.

I am fairly convinced that it is snake oil. Especially for a reef,
where all the bacteria you need is on the live rock.