I used to dose vinegar and it worked. The reason I chose vinegar was because it was less prone to cyano blooms, according to my research. You do have to be careful you don't overdose or you will strip your system of nutrients, hence the aminos dosing. I had good results with vinegar, but they did dull the color of my SPS because my system was too low nutrient. That could have been fixed by decreasing the dosage though. The only thing about vinegar/vodka dosing is that you can't skip a dose, you have to be very strict with the dosing or else it won't work. But at the time, I was dosing vinegar manually and I'm sure it'll make it easier with a doser, but I still was a little paranoid than just dosing by hand. Today, I started running biopellets and once I get my Salifert test kit, I'll see how they're doing. Vinegar/vodka is just a more controlled way of dosing and allows for fine adjustments as opposed to biopellets where you're just putting in a certain amount.