As you can see in these following videos, capillaries are able to suck away little waterhills in the surrounding areas of floaters, so that a floater in a capillary rises more than a floater outside a capillary.
For this you can create a circulation between the two floaters, that creates energy, but the question is, where does this energy come from ?
here is the 111 sec version :
and here the detailed explanation :
Please let me know, why do you think this is compatible with energy conservation as far ?