Brightwell Aquatics NanoCode B Nano Reef Alkalinity Buffer, 500 ml for Stable pH

Brightwell Aquatics NanoCode B is a concentrated alkalinity buffer for nano reef aquariums, formulated to support stable pH and the conditions corals need for skeletal growth.

• Maintains alkalinity within 7–12 dKH — supports steadier reef water chemistry.
• Supplies molecules for aragonite formation — supports coral skeletons and reef-building invertebrates.
• Contains no phosphate, silicate, or organics — avoids these potential sources of unwanted nutrient buildup.
• Made for small reef aquariums — addresses the water-chemistry fluctuations common in nano tanks.
• Pairs with NanoCode A — supports balance between alkalinity, carbonate availability, and calcium uptake.

Small reef aquariums can experience changes in water chemistry more readily than larger systems, so maintaining stable alkalinity and pH matters for corals and invertebrates. NanoCode B is designed for nano reef maintenance, providing a concentrated buffer without phosphate, silicate, or organic ingredients.

What does NanoCode B support in a nano reef?

NanoCode B helps stabilize pH and maintain alkalinity in the 7–12 dKH range. It provides key molecules involved in aragonite formation, a process associated with coral skeletal growth and reef-building invertebrates. These functions make it an alkalinity supplement for maintaining reef conditions, not a general-purpose aquarium additive.

• Designed for alkalinity and pH support in small reef systems.
• Supports carbonate availability for aragonite formation.
• Intended to help maintain conditions for coral and invertebrate health.

How does NanoCode B work with NanoCode A?

Use NanoCode B alongside NanoCode A to support calcium-to-alkalinity balance. The combination is designed to balance alkalinity, carbonate availability, and calcium uptake, supporting longer-term stability for reef-building organisms. NanoCode B supplies the alkalinity-support component of this pairing.

• Pairing is intended for balanced reef conditions.
• Calcium uptake and alkalinity are addressed together through the two-part approach.

What is NanoCode B made without, and where is it made?

NanoCode B contains no phosphates, silicates, or organics. Avoiding these ingredients helps limit unwanted nutrient additions that may affect water quality or encourage algae. The product is made in the USA by Brightwell Aquatics, a brand focused on innovative, scientifically backed aquatic-care products.

• 500 ml bottle of concentrated alkalinity buffer.
• No phosphate, silicate, or organic ingredients.
• Made in the USA.

NanoCode B suits reef keepers maintaining a small aquarium with corals or reef-building invertebrates who want alkalinity support as part of their water-chemistry routine. It is designed for nano reef systems and works as the alkalinity component alongside NanoCode A.

Read our guide: A beginner’s aquarium set-up checklist: from bowl to tank