So here's a puzzler. I've had two aquariums running for a few years now. I had a planted, high-tech 55 gallon community tank at my home, and a planted 10 gallon cherry shrimp tank at my office. Both tanks have had snails in them, with both having Malaysian trumpet snails, and my 55 gallon having mystery snails and rabbit snails as well. I've never had bladder or ramshorn snails. The plants in both tanks have been there since the beginning, and I haven't added any new fish, plants, or snails in over a year. About a month ago I decided that my job was getting too busy to keep up two tanks, so I brought my cherry shrimp tank home and added all the shrimp, snails, fish, and plants to the 55 gallon. Yesterday I noticed I have a bunch of baby bladder snails crawling all over the tank. I'm 100% certain they're not baby mystery snails from a missed egg clutch. I have no idea where they came from. Can bladder snail eggs lay dormant for multiple years? If they came from the smaller tank, why would they have never hatched in my 10 gallon at work? I'm completely puzzled by this, as I've always kept tight control over both tanks to keep the MTS population in check.