Found it, might help us keep our snails alive longer.
<Greetings. Your Pomacea is likely attempting to aestivate, i.e., to enter its normal resting phase. In the wild, Apple snails live a life that involves a few months of dormancy each year. The reason they don't survive in tropical aquaria for more than a year is because aquarists deny them this. Kept active for more than 12 months they usually "burn out". So what should you do? Ideally, you'd remove the snail, place it in a container with some wet mud, and let it snooze for at least a month somewhere, taking care that it (and the mud) stayed damp. You could then try and wake the snail up by placing the snail in a bucket and partially covering it with water from the aquarium. Don't cover it with water or throw it into the aquarium just yet, or it will drown! If the snail starts moving about (this may take some hours, because it's in "suspended animation") you're good to go, and can put the snail in the aquarium. The alternative is to leave the snail in your aquarium even though its resting. Sometimes this does no harm, but sooner or later, Apple snails do die when kept going all the time, which is why you never see the full sized (tennis ball sized!) specimens in pet shops or home aquaria. By the way, your pH variations are insanely dangerous, and need to be looked into. Remember, one "step" on the pH scale means a ten-fold increase in acidity or alkalinity. So while 6.8 to 7.4 doesn't sound much, it's actually a huge change, and quite possibly one that is stressful to your fish and snails. Review the carbonate hardness of the water, and check that you're doing sufficient water changes to dilute the nitrate and organic acids in the water. A 10-gallon tank is really too small for Danios, so I'm concerned you have an overstocked, under-filtered system. Cheers, Neale.>
