Vodka dosing is a method of feeding sugar-alcohol (ethanol) to bacteria that consume nitrate + phosphate during reproduction. Excess bacteria get skimmed out, exporting both N and P. Combined with biopellets or stand-alone for ULNS (ultra-low-nutrient-system) tanks.
Practical use in aquariums
Start at 0.1 mL of plain unflavored vodka per 25 gallons per day; ramp up by 0.1 mL/week until target nitrate/phosphate is reached. Watch for bacterial cloudiness in the water column - normal for first 2-3 weeks. Risks: too-fast dosing causes oxygen depletion + cyano blooms.
How Vodka Dosing fits the bigger picture
Understanding Vodka Dosing matters because it's connected to broader husbandry decisions: water chemistry is the foundation of every other aquarium parameter - chemistry mistakes show up months later as livestock loss.
Whatever specific topic brought you here, four fundamentals govern long-term aquarium success: water quality, parameter stability, biological filtration, and species-appropriate husbandry. Skip any one and the others struggle to compensate.
Water quality: ammonia + nitrite at zero, nitrate under 30 ppm freshwater + 10 ppm reef. Test weekly with API or Salifert kits. Use our water parameter checker to score your readings against your tank type.
Parameter stability: stable wrong parameters beat fluctuating ideal parameters. Most fish tolerate a wide pH range if it's stable. Sudden swings of 0.4+ pH or 5+°F kill fish faster than chronic suboptimal values. Use temperature controllers (Inkbird) + automated dosing for consistency.
Biological filtration: the bacterial colony on your filter media + rock + substrate is the engine. Never replace all media at once. Use our filter turnover calculator to size correctly.
Why does my fish keep dying? 5 leading causes: uncycled tank, wrong species pairings, no quarantine, undersized tank, neglected water-change schedule. See full diagnosis.