their haveing babys
Well it depends if you want them in there or not. It's your choice.
apple snails are like the same as a mystery snail and mystery snails need calcium drops added to the tank and algae and veggies of live food and a heater set at the tropical zone range
A black bear eats an ivory mystery snail.
Most suckerfish get too big, but an apple snail (same as a mystery snail) or some ramshore snails are awesome.
I have raised blue mystery snails for a few years and I have never seen one lay eggs when they were the only snail in the tank. I have seen egg clutches that didn't hatch, but I attribute that to an issue of the environment and not the fertility of the eggs.
no
Snails cannot be made to stop reproducing. If you want the snail to stop reproducing in your tank, then remove it from the tank.
If a mystery snail has not moved for more then 3 days, it is likely to be dead. If you do not see it move, this does not mead it is dead. Some snails ony come out at night. If you do not see a snail move, but it is in a different place everyday, it is fine. If it has not moved at all in 3 or more days, it is likely that it is not alive as it will be starving or starved to death. You can try taking a snail out of the tank and keeping it in a separate bucket with some food. This will also help to not polute the tank. If the bucket starts smelling really bad, then it is definitely dead.
Yes or the snail will take in to muck backteria and die :)
Baby snails are almost transparent as are snail eggs. They can be brought in on plants or even in the water that you have brought fish home in.
This is going to depend on what is actually wrong with the snail. If you are seeing signs of shell deterioration, this is being caused by either a lack of calcium in the water, or your PH is too low (acidic), or a combination of both. Make sure that your PH is not acidic, and that you have a source of calcium in the tank such as simply adding some cuttlebone to the tank.