It's a bit of an odd question I guess, but I just converted my freshwater planted tank, to a saltwater tank. I had 2 nerites in the freshwater tank and they of course laid eggs everywhere. When I cleaned the tank I guess I missed some eggs just under the top trim. Now I've got saltwater in and heater on and I have found several egg cases that have swelled and are split open but no sign of any baby snails. Does anyone know if they can stay dormant and hatch once introduced to saltwater?