48 hours update:
Mag goes from tall vase inflation to squat fat. It has to do with the flow in the tank. I have a Maxspect Gyre on the Ocean Gyre Current preset, which will have fairly still periods and then whips it around for a while longer (even sometimes running the impellers backwards). When it's still, the mag gets squat and fat. When the flow is high the mag gets tall and vase like. It's either the mag inflating itself, or the flow pulling it up (maybe a bit of both). The foot is truly just 3" across, but the top is easily 6 - 7".
FTS first:
Closeup including foot in squat mode:
