Im no expert but seems kind of cruel as will be in constant turbulant water or all the bubbles ( will all the bubbles cause health problems)
My thinking may be well wrong but i would of thought the snail would stay low down in the skimmer where the water is where it doesnt get as dirty maybe anyway?
And if it did go up into neck of skimmer it wouldnt be in water as in the neck is where whe bubbles are and popping ?
So if this the case they wouldnt be even cleaning neck of the skimmer.
But im new to saltwater and only owned one skimmer so my thinking is going off how my skimmers looks and behaves
Cerith snails wind up in mine all the time. I just drop them back in the tank. They are quite remarkable in their ability to survive adverse conditions. Often, I remove them from the outside of the tank and drop them back in the middle.