Big Angelfish, Naso Tangs, Triggerfish or Harlequin wrasse, among other voracious muscular beasts, can defeat the magnetic coupling of the regular VeggieMag. Some fish even take great pleasure in running at it and yanking it off the wall. Well, now Two Little Fishies has a response to this behavor: MegaVeggieMag , which uses a 1” diameter x 1” long ultra high strength Neodymium magnet that keeps the clip in place. Great for larger aquariums with glass up to 3/4" thick or big fish!