<https://www.aquaticplantcentral.com/threads/calling-folks-with-liquid-rock.54174/>
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"After being immersed in this hobby for several years, and seeing that what I see does not always jive with what I read from others, I thought I'd post this. \n\nI'd like to have an informal, unscientific discussion here of folks with hard water - defined as kh of 8 or above.  \n\nI have no proof, other than comparing what I experience versus what I read from folks who have softer waters.  But personally, I feel the following are true, at least in my tanks compared to folks who have soft waters:\n\n--Certain plants seem to be more susceptible to stunting\n--Tank doesn't like it when I try to run it lean - algae starts to show itself, and plant growth slows down considerably \n--Even with good CO2, bba has a tendency to show up unless I have an sae in the tank\n--EI-type dosing seems to work better than daily-type dosing\n--Of course, forget about trying to grow any soft water plants like Toninas, and Eriocaulons.  But, for me, I can also forget  a lot of Rotalas, like macranda and some of the Ludwigias as well.\n\nSo anyone care to chime in?  I'd certainly be curious to see if anyone has similar issues, or is my water uniquely different? :)\n\nBTW, my water:  kh 11; gh 13 (mostly Ca)"
<https://www.aquaticplantcentral.com/threads/calling-folks-with-liquid-rock.54174/#post-406373>