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Of course, zero G or very low G water tanks would be much easier to handle than 1G water. Has there been any research on the feasibility of this? On the ISS or somewhere similar? I imagine most aquatic creatures have some notion about up and down and might get very disoriented if up and down disappears.

Preventing space sickness is not the only reason to have gravity. While zero G has obvious advantages when handling heavy objects, in general the physical handling of small things is easier if there is some force pulling at them. Something to bring order in chaos, so to speak. For example, most forms of ore refining use the pull of gravity in some sense to achieve the separation of different fractions. The ability to achieve the same result in zero G will need some serious ingenuity.

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