I got my Gourmet Grazer seaweed feeder today. It seems to be working great the fish have been picking at the seaweed for about a half hour now and I have not seen one piece float away and go down the over flow. The magnet that holds it in place is very strong and holds the feeder in place with no problems. It sure beats the suction cup clips and the wasted food.
If I see any problems in the next few days I will be sure to post them.
The unit is made by Auqa Gadget. They are a bit pricey at 24.95 but they do seem to work. I got mine from amazon but Bulk Reef also has them.