So I just walked in my brothers room to check his tanks as I do every night,I saw small white dots and I looked closer and there was about 50 snails about the size of the tip of a pen. He hasn't had any new live rock added or coral in the past month and I know they haven't been in there long as I am very observant of the hitchhikers in our tanks. Any ideas? Can't post pics from my phone I'll get him to put some up tomorrow.