Quote:
Originally Posted by dwalstad  For tanks with extremely softwater (GH <4 and < 70 ppm CaCO3), I suggested that hobbyists add a little calcium to their substrates or to the water. If your water has a normal water hardness, then you probably don't need the additions.
This information is in my book (pp. 86, 137, and 185). |
I suspect that the tap water in my area (London UK) is fairly hard, so there should be no need for added calcium. Thanks, Diana