alk is at 2.4
Ca is 460
pH runs around 8.1
I do not drip kalk.
I did switch to a different light that was only 2700K. I have put my 6500K back on it to see if that is the difference. I am planning on ordering a 5100K from HD.
An experiment posted on another board found that the 5100K grew chaeto very well compared to the 2700 and 6500K lamps.