The issue is not so much that your Ca
is extremely high...it is that your Alk
is low relative to the Ca
. Your Ca
is out of balance and since there is no easy way to remove Ca
, you'll have to add Alk
to get balanced.
You're not WAY out...just a little bit. I don't think it is too serious.
Your clam, coraline etc etc will draw down BOTH Ca
in a balanced fashion. Another way to look at this is that these guys need BOTH Ca
and they can only be as successful as the lowest of these two allows. Right now, the Alk
level would be limiting the amount of Ca
that the clam can use. All that Ca
can't be used since there's not enough Alk
to use it all.
Yes, it sounds like the salt is probably the cause and more water changes aren't going to