[Doug]

Andrew points out a large reason why. Lack of critters in a new system and of course, to fast of an addition of kalk or other calcium raising additions.

I was just asking Julian Sprung questions on that at Reefs Org Mag. question forum. He had said in his plenum article, that high alk. could perhaps contribute to clumping.

Anyhow there are a couple good answers there from both Julian & Dana Riddle.