Hi pitabread,
I have the same problem here in Seattle due to our water which is very, very soft (1-3 degrees KH). As a result I regularly have to add calcium to my tanks to avoid stunted, curled, "singed" looking leaves. I dose CaCl (Calcium chloride) and Mg2SO4 (Epsom Salts) at the doses recommended by Rex Grigg
http://www.bestaquariumregulator.com/dosing.html and the new leaves on my plants start looking much fuller and healthier in just a few days to a week. Of course, the stunted, curled, "singed" leaves do not recover.....that is what trimming is for!
BTW, here is a site I found very helpful in diagnosing deficiency problems.
http://www.finostrom.com.gr/images/a...lizers/map.htm