i have some alternathera reneikii and i've noticed a few of the plants are showing signs of what i would think is a calcium deficiency. i tried to take pics but my camera sucks. i image search for calcium d and one of the first pics that came up was this http://www.defblog.se/picture/1542.html. it looks identical to the leave growth on my plants. i did a calcium test and it says that i have 60ppm. what's going on?