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Last night I shined my flash light into the tank in the middle of the
night, and saw dozens of large Malaysian Trumpet snails out foraging.
However, they all have 2-color shells. Two-thirds of the shell, towards
the pointy end, are white; the last one-third is the normal brown color.
Does this indicate insufficient calcium in the water? Do you know if this
means that I had insufficient calcium in the past, and now I'm okay
(because the new section of the shell is normal), or do they draw calcium
from the old part of the shell to make the new part? Or is there a
"weathering" effect that just make the older part turn white (due to some