Very cool idea

[outtafocus]

great idea, just needs minor ajustments to make it even less visible.
Instead of glueing the power head to the magfloat, try gooping the magnets directly to the PH, and seal with silicone to ensure no water gets to the magnets.
Sticking it to the magfloat causes the PH to stick out from the glass just a bit to much.
Thats my 2 cents