I just can't see any type of snail getting the run of the tank. Shrimp might last longer but will probably be stalked eventually. FWIW I had three cherry shrimp in my f8 tank for at least 4 weeks. They hitchhiked on some bacopa I added. I moved them to another tank after I spotted them but I've no idea if there was any more and they got eaten. It is a (light) brackish tank so it was a surprise to see them combing through the java fern.
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