hey champ,
a crayfish already gets from its shell,thats why it eats its shell
after molting,this is the reason why they eat it to help harden up
their new shell.you might be onto something with adding calcium to the
water as im guessing calcium builds up on their shell already leaving
it a good source of it once they molt,but im unsure of the need to add
liquid calcium to the water.if your still willing to try out your
theory,try it on one test subject an follow the instructions to the
letter so you dont add to much,an let me know how it goes thanks.

--- In crayfishworldaccessgroup@..., "erikaandnewton"
<emcisme@...> wrote:
>
> so, the crayfish has molted for the second time in two weeks. This
got
> me to wondering itf it might be a good idea to add some calcium to
his
> water. I have liquid calcium I use for something else, so I could use
> that. do crays need extra calcium for molting, if not would it hurt
to
> give him some?
>