The major downside of vodka is that it has the highest likelihood of fueling cyano. If you aren’t seeing a Cyano increase, I’d keep using vodka. It is less likely to fuel dinos.What downsides are possible with vodka? Any difference on their effect on p04? I'm content with the results of vodka, but always wondered if I'm missing out on anything.. sound like "leave good enough alone"(?)
Carbon dosing with vinegar or vodka is ineffective for phosphates. You’ll most likely bottom out nitrates long before phosphates reduce.