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Printed using PETG with 0% infill and 0.8 mm walls and top/bottom. Print the mount on its side with supports for the peg. Clearances are pretty big so it should be a loose fit and free to rotate.

You might need edits for the mount to fit your tank. 

Update: added a 12 mm and 6 mm mount and parameterised Fusion file. Make sure the floater can support its own weight and the weight of a connector when customising dimensions.