I tried to add some hermits with my old dog puffer and he had been in my tank 7 years with no inverts. Once I added the hermits, he was always watching them. He would pick them up on occasion. I removed them before he could eat them.
I did have 1 olive snail and 1 turbo snail last about 6 months. I moved them when I set up my other tank.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,