[Randy Holmes-Farley]

If anything this method is easier on the fish, I had problems with fish eating, or trying to eat the white kalk paste. I for one wouldn't like a mouth full of kalk. The sodium hydroxide method is much safer in that it is completely soluble, such that any solution which doesn't make it into the aiptasia, is quikly netralised by surrounding water by the above reaction, and no solid remains to be eaten by fish.

You've tried this? You did not get precipitated magnesium hydroxide solids?