Getting rid of algae in a reef tank primarily involves removing the existing growth and addressing the underlying causes to prevent its return.
Based on effective strategies, you can tackle algae by manually cleaning, increasing water changes, controlling feeding, and introducing beneficial algae-eating organisms.
Effective Methods for Algae Control
Combating algae in a reef tank requires a multi-pronged approach focusing on both physical removal and nutrient control.
1. Manual Removal
The first step is always to get the existing algae out of the tank.
- Scrape: Use an algae scraper (magnetic or blade) to remove algae from glass or acrylic surfaces.
- Siphon: Siphon algae from the sandbed or rocks during water changes.
- Brush/Pick: Use brushes or picks to get into crevices on live rock.
Manually remove as much algae as you can. This immediately reduces the biomass and prevents it from releasing spores or nutrients back into the water.
2. Increase Water Changes
Regular water changes are crucial for lowering nutrient levels that fuel algae growth.
- Frequency: Increase your tank water changes to twice a week.
- Volume: Perform standard water changes (e.g., 10-20%) but more frequently.
- Benefits: This helps export nitrates and phosphates, which are primary nutrients for algae.
3. Control Feeding
Excess food in the tank quickly breaks down into nutrients that feed algae.
- Limit Quantity: Keep fish feeding to a level that eliminates extra food in the aquarium. Feed only what your fish can consume within a few minutes.
- Quality: Use high-quality foods that are easily digestible and produce less waste.
- Observation: Watch your fish eat to ensure no food is sinking or floating uneaten.
4. Introduce Algae Eaters
Natural grazers can help manage nuisance algae populations.
- Variety: The addition of algae eating animals such as snails, hermit crabs, urchins, blennies, tangs & rabbitfish may help curb additional growth.
- Selection: Choose species appropriate for your tank size and inhabitants.
- Supplementation: Be prepared to supplement their diet if algae levels become too low, to prevent starvation.
Here's a quick look at common algae eaters mentioned:
| Algae Eater Type | Examples from Reference | Notes |
|---|---|---|
| Invertebrates | Snails, Hermit Crabs, Urchins | Excellent for cleaning surfaces & rocks |
| Fish | Blennies, Tangs, Rabbitfish | Can cover larger areas; diet varies by species |
Combining Strategies
For the most effective results, combine these methods. Start with a significant manual clean-up, implement a temporary increase in water change frequency, ensure you are not overfeeding, and consider adding a suitable cleanup crew. Consistency is key to long-term algae control.
