My reef has been up and running almost a year and a half. Very happy with it, getting great growth and coloration from everything. But I did test and my nitrates were around 20-25 ppm. I have chaeto growing in my sump, along with skimmer, and purigen. I dose Kalkwasser daily for calcium requirements. I'm reading about the wonders of vodka dosing to bring down nitrates and that it also helps with water clarity and coral coloration. I'm also reading about adding vinegar to my kalkwasser. How many of you dose either of these, and are you noticing really clear results?