Brightwell Aquatics MicroBacter Start XLM - 15x Concentrated Freshwater Nitrifying Bacteria, 4.22 fl oz

Overview

Brightwell Aquatics MicroBacter Start XLM delivers a highly concentrated blend of live nitrifying bacteria designed to establish or re-establish the biological filtration that keeps aquarium water balanced. The 4.22 fl oz bottle is formulated to support a quicker nitrogen cycle and stable water quality, making it a versatile addition to both new setups and ongoing maintenance.

Fast, reliable cycling

This 15x strength formula is engineered to accelerate beneficial bacteria colonization, helping many tanks move toward a balanced state in about seven days. When time is critical, MicroBacter Start XLM provides a practical option to shorten the cycling period without compromising care.

• New tank startups may cycle more quickly, reducing the risk of early imbalances
• Helpful after cleaning, rock or substrate work, or post-medication recovery
• Supports higher population densities by stabilizing ammonia and nitrite levels

Versatility across water types

Although designed for freshwater, MicroBacter Start XLM is compatible with different water types and substrates, enabling a broad range of hobbyists to use a single product for multiple setups when used as directed.

• Suitable for tanks with sand or rock substrates
• Base formulation supports longevity during storage and shipping
• American-made excellence reflects a science-backed approach to aquatic care

How to use

Follow the dosage guidelines based on tank size and bioload. Use after a routine cleaning or after medications, then monitor nitrogen-related parameters to gauge progress as the tank stabilizes.

1. Open and add the recommended amount to the aquarium water
2. Proceed with any ongoing filtration routines as advised by your setup
3. Re-test ammonia and nitrite over the next 3–7 days

Quality you can trust

From Brightwell Aquatics, an American-made brand known for innovative, scientifically backed aquatic care solutions, MicroBacter Start XLM combines practical formulation with long shelf life to support vibrant underwater life.