My tap water is 12°dKH.
When I do weekly 50% water change it goes down to about 9 degrees which is consistent with about 6 degrees before water change. This is in one of those small, high light, CO2 tanks. About 55L (15G), 3.6 WPG (3*18W of FL with reflectors), very high plant biomass (check the picture in my gallery ).
Now, what I'm wondering is, is it possible to hit Ca or Mg deficiency with that carbonate hardness?
When I do weekly 50% water change it goes down to about 9 degrees which is consistent with about 6 degrees before water change. This is in one of those small, high light, CO2 tanks. About 55L (15G), 3.6 WPG (3*18W of FL with reflectors), very high plant biomass (check the picture in my gallery ).
Now, what I'm wondering is, is it possible to hit Ca or Mg deficiency with that carbonate hardness?