Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I think that is the same sort of volcanic rock that I have in my tanks. I am just a few miles from Pittsburg, and the masonry/rock/landscape stores pretty much all have that same rock.
Now the sand... not sure about it. 'Yellow' does not usually describe a limestone based sand (usually white), but maybe.
GH tests high in the tank. 10 degrees. (10 drops with API tests, or well into the brown on most dip stick tests- I do not have a bottle to look at)
Using Arrowhead Distilled Water, GH test shows 0 (it should- distilled has no minerals)
Sand and rock in tank seem to be neutral.
Not adding anything like GH booster, Epsom salt or any other source of minerals.
Something wrong with the tests?
When API GH test fails it usually does not change color.
Double check the instructions, and be sure you are seeing the color change at the right moment. It can be hard to detect, especially in poor light or with some colored stuff in the background, refracting through the test tube.