Healthy Shell Growth

[snerdahmik]

I've noticed with my aspersas, their shell colours have changed! Around the time I could only supply them with eggshell, their shells were light brown in colour. Then once I got them a cuttlefish bone, my eldest snails' shell colours dramatically changed.. It started growing dark brown with nearly black bands. There's a very obvious line across the shell where the colour suddenly changed. My other aspersa's shell is also growing dark brown now that she's gotten used to the cuttlebone.

They have little 'choppy' line markings across their shell where they didn't grow for a while, then suddenly had rapid growth but didn't develop pattern. I was wondering if I could raise babies with near perfect shells. The bad growth was mostly caused by them not eating the food provided. I saw on multiple different posts that how much protein they get can affect their shells growth as well as calcium. 

What I can I do to ensure the hatchlings grow nice looking shells? I already provide protein weekly, and there's always calcium in the tank for them.

[littlegoldsnail]

I rescued a dozen snails from a ladies garden, had the exact same thing happen.

[snerdahmik]

Dec 1, 2019 1:10:50 GMT littlegoldsnail said:

I rescued a dozen snails from a ladies garden, had the exact same thing happen.

I have an off-topic question. You've raised aspersa eggs before, right? I'm worried the eggs are infertile. I don't know what they're supposed to look like. I figured I'd ask you since you seem really knowledgeable.

petsnails.proboards.com/thread/17866/tell-eggs-developing 
^{This post has context for how the eggs are being kept.}

The squishy membranes of the eggs have clearly become thinner, and in some places there are little dark grey speckles. I checked on the eggs earlier as I was misting and I have accidentally crushed one. The outside of the egg was still kind of squishy and wet, but it was like a soccer ball with only half of its air and something hard in the center. Did the egg dry out, or was that a baby? Are they developing or have they gone bad?