So, at the end of last year I found an elephant snail in my tank. It must have come in on another snail when it was tiny. First time I noticed it it was about the size of a half dollar. For the last couple months I couldn't find it. Turned up in my sump today. Only way there is thru plumbing. Must have squeezed into the overflow and made its way down the return. Any opinions? Should I just leave it in the sump or put it back in the tank? I can't find any info that says it's a threat to anything, but I'd hate to have it clog my plumbing. Apparently it can't go wherever it wants.