I have not found any in the cup yet, they just seem to like the sludge growing on the tube and seem to thrive in the bubbles. I clean my tube and cup every day so not sure they wouldn't be in the cup if I left it for a few days.
I have had skimmers on my tank since the early 90's when I had my first Sanders limewood airstone skimmer but never experienced snails in the actual skimmer column.
My strombus snails clog up my gyres and I have to put those plastic slide on filters over the turbines to keep the little buggers out. The strombus snails also clog up my overflow tube so I have to flush them out monthly by turning the valve wide open but they don't get past the filter socks.
I have never found a trochus snail in my filter sock.
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