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What I did was when they got pretty hard on the aquarium i gently pulled it off and put it on a damp sponge, when they get close to hatching I put them on a tupperware top and float it in water.
Does not matter at all what color the parent snails are. Depending on the colours, you'll get various colours in the offspring, which is fun. Even if the parents are the same colour you can get variations in the offspring. Just watch and see.