I posted this as question on another thread but I realized from amcarrig's answer that I should start a new on. My question was - I am confused. I do water changes about once every 6 weeks, I dose with Purple up, additional Calcium, Kent essential Elements, Iodine and Kent Super buffer when needed. I am about to start using Magnesium as well. What I do not understand is - based on the responses in this thread, I should not need to be doing all this. I don't get it? Her response with my answers inserted was: I 100% agree. I took all this into consideration before dosing Iodine. I actually bought an Iodine test kit first and even with all the other products I was still at almost Zero. I concur. I test for all these things regularly. My Ca is constant at 420-440. My dKH was constant at 11-12 but recently dropped to 10 so I started adding buffer. I have also been reading this forum extensively and that is why I recently bought Magnesium. My Magnesium is constant at 1280 but I understand that if I keep it a little higher it should solve my dKH issue. So that brings me back to the question of - Why am I dosing so much?