All is still well with my tank - no additions and thankfully no deaths either.
I've just been away for three weeks and upon my return found Goblin (my golden apple snail) to be missing a chunk of his shell near the rim. I can only guess that he landed a bit unfortunately on one of the rocks. I've examined him closely and where the shell is missing there is soft tissue. Well, I say soft but that's only in comparison to the hard shell. I think the tissue has a tough outer layer to it. The snail seems to be perfectly happy and still performs his daily acrobatics (climbing to the top and floating down on his foot ... )
Does anyone know if the missing shell will eventually be regenerated?
yes he should be fine, that edge is where the shell grows anyway, so it should fill in as the rest of the shell grows, may not be even for a while, and you'll be able to see where he broke it, but should be fine!
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The temperature in the tank fluctuates between 23.6 and 24.2 degrees C (depending on the time of day) so I suspect he'll heal over time. It looks awful at the moment and I was quite concerned to feel how soft the bit underneath the missing shell was. If I get the chance I'll put up a pic later today/tomorrow.