Brightwell Aquatics BacStart XLM Marine Starter Culture - 125ml | Live Bacteria

Brightwell Aquatics BacStart XLM (MicrōBacter Start XLM) is a professional-grade, 15× strength live nitrifying starter culture developed to rapidly establish biological filtration in marine and brackish aquariums. This powerful bioculture is designed to dramatically speed up the cycling process in new tanks—often completing cycling in around 7 days when used as directed.

Ideal for new aquarium setups, BacStart XLM is equally effective for emergency recovery situations, overcrowded systems, or after major maintenance such as cleaning substrate, live rock, or biological media. Its live, non-pathogenic nitrifying bacteria rapidly convert toxic ammonia and nitrite into less harmful compounds, helping prevent fish loss and “New Tank Syndrome.”

Key Features:

• 15× concentrated LIVE nitrifying bacteria culture
• Rapidly reduces toxic ammonia and nitrite
• Accelerates aquarium cycling in marine & brackish systems
• Helps prevent New Tank Syndrome
• Ideal for new tanks, emergency recovery, and overcrowding
• Re-establishes bacteria after medication use or heavy cleaning
• Can be safely overdosed up to 5× during emergencies
• Enhanced shelf life and temperature tolerance

Brightwell Aquatics BacStart XLM 125ml is a high-performance marine starter culture engineered for fast, reliable biological filtration. Whether you are cycling a new aquarium, adding fish, or recovering from a filter crash, this ultra-concentrated live bacteria solution provides rapid ammonia control and long-term system stability. A trusted essential for reef keepers and marine hobbyists who need quick, safe results.