Hi all. Here is a strange one. I have a 20 gallon goldfish tank that I set up approximately 11 weeks ago. A couple of weeks ago I noticed I had a new inhabitant in the tank (a snail). It seems to be growing rather rapidly. Here's the thing, there are no live plants (only artificial) which were purchased new along with all decorations, gravel etc which were also purchased new. The tank was used but was empty when I bought it. First off I have no idea where it would have come from and second I'm trying to figure out what it is.It is a bright red in colour and not the norm of a snail transfered from a freshwater aquarium or plants. Anyone have any ideas?