Regime
Lean Dosing
Philosophy
Lean Dosing is a minimalist, conservative fertilization approach designed to give the hobbyist maximum control over plant growth rates and pigmentation. The central philosophy assumes that the bulk of macro-nutrition (especially nitrogen and phosphorus) is already supplied by the tank's bioload (fish waste, uneaten food, decomposition) or a rich, mature substrate. Consequently, water column dosing is kept lean and restricted almost exclusively to micronutrients and trace elements.
Macros are only added individually in tiny amounts when water tests or visual symptoms confirm a true deficiency. By keeping the water column nutrient-poor, the risk of algae blooms is minimized, forcing plants to slow down their metabolism. This controlled growth state promotes compact internodes and triggers intense red coloration in demanding species (such as Rotala or Ludwigia), driven by deliberate and targeted nitrogen limitation.
Recommended nutrient targets
| Parameter | mg/L |
|---|---|
| N (NO₃) | 5 |
| P (PO₄) | 0.5 |
| K | 10 |
| Fe | 0.1 |
| Mg | 2 |
| Ca | 10 |
| B | 0.005 |
| Mn | 0.05 |
| Zn | 0.005 |
| Cu | 0.002 |
| Mo | 0.001 |
Dosing frequency
2-3x/week micros only, macros on demand from tests
Water change
20-30% weekly
CO2
Not necessary
Light
Low (15-30 PAR)
Pros
- Minimal product use
- Low algae risk
- Perfect for mature tanks
- Low maintenance
Cons
- Requires frequent testing
- Slow growth
- Not for demanding tanks
- Risk of deficiencies
Common Errors
- •Waiting for plants to show obvious structural deficiencies before dosing macros.
- •Not having a deeply mature and organic substrate from which plants can draw nutrients.
Advanced Techniques
- •Injecting macro-nutrients with a syringe directly into the substrate near the roots of demanding plants (e.g., Eriocaulon), leaving the water column pristine.
Ideal for
Low-tech tanks with undemanding plants, nutrient substrates, or significant bioload.
