I did a reference test on a new Ca test kit and it states 470 on the bottle but was near 100. That is the same result I received on the actual tank sample. I tested phosphate which was practically zero, nitrates were also near zero. I have a Red Sea Mg test kit and it never changed to the blue color. I also tested alk again and it was 2.5. When I read the article, it states a relationship between Ca and alk and I would think if my Ca is really that low the alk would not be as high. I am going to do another large water change today. I added two turbo snails, two emerald crabs, one coral banded shrimp, sand shifter starfish and a pencil urchin. Both snails did not make it, only one of the emeralds is still going, the shrimp died over night, the starfish is still going and the urchin died. The zoos, softies, cabbage coral, yellow polyps, button polyps look good. The three fish are doing fine also. I have one two headed torch coral and it has not come out for a few days and only a little bit when I first added it. I am hesitant to pull out all the rock, bleach etc. and replace the sand bed.

I am going to have the water tested at the LFS before doing a significant action such as that. Thanks for your assistance.