I've seen something similar to a bumblebee snail in my tank on occasion, although most of the time it's out of sight in the rockwork or sand. I believe mine has a yellowish shell with only a single black stripe, not multiple. It does have the 'proboscis' like appendage at the front though. It's been a while since I researched anything on similar specimens but I recall my findings were that it is a nassarius, stays relatively small and is considered generally beneficial. I also found that they can be mistaken for something called a 'whelk' which can grow relatively large and is much more of a hazard in our systems. I think if yours are nassarius, you shouldn't be overly concerned unless they are overwhelming in numbers, which as mentioned, could decimate other beneficial life in your sandbed, LR, etc.
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