Thanks, I was wondering maybe hoeksemai too.
PS. The mushrooms are a constant battle of removal. Eventually I am just going to replace all my rock, but I'm waiting to do a tank upgrade at the same time. I can at least assure you though that the mushroom laden rock in that picture above have been sold to a reefer more appreciative of mushrooms. All I have left are the ones I can't get at without tearing apart rock structures. Every now and again I'll have some mushrooms reach the problem stage and I inject with kalk but unfortunately it is only a temporary band-aid solution, they always come back, always. I wish I could find something that eats them, but most things seem to know better.