Stoutman wrote:
No coral. Only live rock and fish. I only dose kalk with top off water.

Do you ask because coral will bring my water out of spec? Why do you ask?

Probably because coral 1) requires better quality water and 2) is part of the
definition of a "reef" aquarium.

George Patterson
Coffee is only a way of stealing time that should by rights belong to
your slightly older self.