I use Tunzes long and time to time a razor scrapper for detail
I tried the magnetic one, the suction cup, rock looking type, all too no avail. None of my guys will eat sheets, I bought every type and color, Jesus the money I spent on that.
The one they go crazy for, all of them, tangs, angels and damsels are the Vitalis disks. Took 3 times putting it in, but now they all wait for it. Amazing to see them all gather and go crazy.
They come with a suction cup that fits the disk. I order mine from reef supplies. I only bought the small one first, then once I saw how they reacted I now get the large one. When a hunk falls off the brand and snails all congregate. Good entertainment