I've seen nothing but good things come from dosing vodka. I had a 75 gallon that had an old DSB and had no bad issues except a little cyno every no and then. I started dosing my 4 month old 150 and dropped my Nitrates from 50 to 2 and Phos from 2.83 to .58 (hanna) in 5 weeks, of course I have been doing bi weekly 20% water changes. Vodka does work but you need to pay close attention to your corals and sand bed and follow the instructions to a tee. Oh and MB7 is the key.