Now you can put the food where your fish are with this innovative magnetic seaweed clip. Using the magnetic clip and extension bar you can now move your seaweed feeding clip to any spot you desire in your aquarium. And unlike its suction cup counter parts the powerful magnet will not allow your feeding clip to fall off, be pulled off by your fish or move around undesirably. Magnet is powerful enough to be used on tanks up to 5/8" thick.