yeah thats the answer I thought most reefers would have. I did some number crunching and would be able to sell them for about $1500 that would leave me with less than 10% profit margin, thats sad. Not really worth the time and effort. Oh well Im still gona make 3 or 4 of them and market them to the rich and frivilous.

I use "algae free" magnets with a couple extra layers of acrylic cleaning pad on the inside half of the magnet to follow the contour of the tank.