Refugiums
Refugium Buyer's Guide
A refugium can be one of the most effective and low-maintenance ways to manage nutrients in a reef tank. Whether you want better nitrate and phosphate control, a more stable pH, or a safe place to grow pods and macroalgae, the right refugium setup can make a noticeable difference.
What To Look For In a Refugium
Fit Your Aquarium
- Sump refugiums are ideal for larger or more permanent reef setups
- Hang-on-back refugiums are great when sump space is limited
- Compact refugium options can still be effective with the right light and regular harvesting
Focus On Lighting
- Refugium performance depends heavily on strong, plant-friendly lighting
- More light generally means faster macroalgae growth and more nutrient export
- Running the refugium light opposite your display can help support pH stability
Choose The Right Goal
- For nutrient export, focus on macroalgae growth and easy harvesting
- For pod production, create a protected area with gentle flow and structure
- For balanced filtration, pair proper flow, strong light, and routine maintenance
Different Types of Refugiums
Sump Refugiums
Best for reef keepers with a sump who want the most flexibility, more macroalgae growth space, and easier long-term nutrient export.
Hang-On Refugiums
A smart option for aquariums without a sump. These work well when space is limited but you still want added filtration and pod production.
All-In-One Refugiums
Ideal for compact systems with rear filtration chambers. A great fit for smaller reef tanks looking for a simple refugium solution.
Refugium FAQs
What does a refugium do in a saltwater aquarium?
A refugium creates a dedicated space for macroalgae, beneficial bacteria, and microfauna to grow outside the main display while helping reduce nutrients.
Benefits of a Refugium
- Natural nutrient export via macroalgae growth and harvesting
- Supports proper pH levels by removing excess dissolved CO2
- Increases biodiversity and creates a safe place for pods, bacteria, and other beneficial microfauna
- Helps balance nutrients to reduce nuisance algae and pests
- Allows you to keep macroalgae and invertebrates outside the display
Do I need a big refugium?
No. Strong lighting and regular harvesting allow even smaller refugiums to be effective.
Can a refugium help pH?
Yes. Running the light at night can help stabilize pH by reducing CO2.
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