Although our Veggie Mag is designed to work on glass up to 3/4” thick when feeding normal-sized fish, big Angelfish, Naso Tangs, Triggerfish or Harlequin wrasse, among other voracious muscular beasts, can defeat its magnetic coupling. They even take great pleasure in running at it and yanking it off the wall. Well now we have a response to this behavior: Mega Veggie Mag, which uses a 1” diameter x 1” long ultra-high strength Neodymium magnet. That will keep the clip in place. Watch the surprise in your big fishes’ eyes as they try but can’t yank the clip off. Be sure to fold the Sea Veggies sheet so that it forms a thick layer that stays in the clip jaws