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I need to know what this is coming out of my black mystery snail I'm new to snails and couldn't find anything about it in searches I'm not sure what this white is. Could it be eggs?
They go above the water line to lay eggs. If your water parameters are good and in the safe level. I would relax a little and check out what it ends up doing.
There is a air tube which can come out, sex organ or a it could be pooping.