How to Dosing for Beginner Reefers - Step by Step
Step-by-step guide to Dosing for Beginner Reefers. Includes time estimates, tips, and common mistakes to avoid.
Dosing can feel intimidating at first, but it becomes simple when you focus on stable alkalinity, calcium, and magnesium instead of chasing perfect numbers. This beginner-friendly guide walks you through how to choose between two-part and kalkwasser, test correctly, and start dosing safely without stressing your corals.
Prerequisites
- -A saltwater reef tank that has completed the cycle and is at least lightly stocked with corals or coralline algae
- -Reliable test kits for alkalinity, calcium, and magnesium, plus a refractometer calibrated to 35 ppt or 1.026 SG
- -A way to measure tank water volume accurately, including display, sump, and displacement from rock and sand
- -RODI water for mixing supplements or topping off evaporation
- -A reef-safe dosing product, either two-part alkalinity and calcium or kalkwasser powder
- -Measuring syringes, graduated containers, or a dosing pump for accurate daily additions
- -Basic target ranges written down - alkalinity 7.5-9.0 dKH, calcium 400-450 ppm, magnesium 1250-1400 ppm
Many beginner tanks with only a few soft corals or a single small LPS colony do not need daily dosing yet because regular water changes can replace what is consumed. Test alkalinity, calcium, and magnesium before doing anything else, then compare the results to common reef targets. If your alkalinity stays stable between water changes, hold off on dosing and keep monitoring.
Tips
- +Start with alkalinity first because it changes faster than calcium or magnesium and usually tells you whether supplementation is needed
- +Test at the same time of day for better comparison, especially if your pH swings between day and night
Common Mistakes
- -Starting dosing just because you bought corals, even though your tank consumption is still very low
- -Assuming calcium alone matters more than alkalinity in a growing reef
Pro Tips
- *In a beginner mixed reef, prioritize keeping alkalinity stable between 7.5 and 9.0 dKH rather than chasing a specific calcium number every day
- *If you use kalkwasser, start with no more than 1 teaspoon per gallon of RODI for the first trial instead of jumping straight to a fully saturated mix near 2 teaspoons per gallon
- *Dose alkalinity at night or after lights out if your pH tends to run low, but always verify with testing before making that a rule
- *If your tank is under 20 gallons, use a syringe or dosing pump that can measure small volumes accurately because even a few extra milliliters can shift alkalinity quickly
- *When a test result seems off, repeat the test before adjusting dosage because bad reagent technique causes more beginner dosing mistakes than actual coral demand changes
Keep a clean backup log for test day.
The Printable Reef Logbook gives you water testing, dosing, maintenance, and livestock worksheets you can print or save as a PDF.