Sherry Michael Weller wrote in message .. .
I've never seen shells in Flourite. Dark and light bits, yes.Your sure
it's shells? Did you have gravel or anything else in there before?

Yep, I checked the Flourite left over in the bag and found some small
shell fragments. While I did have gravel in it before, there were no
shells in it that I know of.

The question still remains, how badly is this screwing up my water
chemistry? And if it is, will is remain at KH=7, or will it drop
slowly as the shells dissolve away?

Ken