Okay, so over the past few days my family and I have been swimming at my moms lake house. It is a man made freshwater lake.. All of the fish that live there are added, all of the wild life in this area has been added from the park/recreation people. Well we were digging in the shallow waters under our feet and a few days ago I came across a HUGE snail. It was about 3 inches long. and I was like WHOA. Well we put it back and I thought nothing of it til later when I got home. So I googled a few opinions and some people have added wild fish/frogs/snails etc to their tanks and had great success. and some did not. Today we had a bucket for water, and I found another big snail. I was wonder what would happen if I added him to my freshwater tank at home. What would be the pros and cons of it. I have not put him in any of my tanks with any fish. he is sitting in the water from the lake. Here is a picture. I want to keep him... Also what about a few freshwater clam/muscles I found. what do you think on all this?