I am not sure I quite understand your question. Why put tortoise eggs in a water tank?
Go to the Tortoise Trust website for information. www.tortoisetrust.org
They hatch out of eggs.
Tortoise do not sit on their eggs (they are not warm blooded so they can not warm them), they bury them in a nest made in a warm moist place and they hatch naturally.
They bury them in sand/soil and leave them to their desitny
A sparrow normally lays two to three eggs. Sparrows have very low mortality rate and thus the three hatch-lings are likely to survive to adulthood.
Like a mythical dragon, tortoises tend to hatch when they think the occasion is right, especially when the planets align, a suitable caretaker is nearby, or on a blue moon. If the tortoise is retarded (like the majority of them), then it will probably hatch whenever it feels like coming out of it's little shell. Unfortunetly, the stupid human caretakers will think that the eggs are duds and will dispose of the eggs before they want to hatch.
no
the water won't affect the eggs and they still have plenty of time to hatch
depends on temperature its being incubated. It usually takes around 80 - 120 days.
they can be has big as the tortoise
She could - but the eggs wouldn't hatch.
Each sack can contain up to 1,000 eggs, the female can produce 4 to 9 sacks a summer but she will eat most of her hatch lings and normally less than a http://wiki.answers.com/q7546688.htmlwill survive.
Eggs laid on land are hatched on the land and eggs laid in the water hatch in the water. *o*