lol! jonthefishguy!
Kalkwasser only adds calcium to the tank, it does not hinder the growth of nusance algae. Calcium is a much needed element in reef tanks because many of the inhabitants need it. Anyways, your problem:
Make sure that:
1. nothing has died.
2. biowheels are still going.
3. your carbon is changed out regularly.
4. you are not overfeeding.
5. you have not changed your lighting schemes
6. you do regular water changes.
7. have an efficiant running skimmer and it is clean and producing skimmate.
8. do not have any sponges that are collecting debris
After you have done that you have a few options:
1. Take a turkey baster and blow as much cyano off of everything as you can and then do an emergency 50% water change, sucking all of the debris out of the tank
2. Scooping as much of it out as you can manually.
3. Using a product called Chemiclean (follow directions very very carefully) (I do not recommend this step)
4. Reduce your lighting while doing all of this.
It sounds like a lot, but it's just mainly common sense on how to solve a cyano problem.