Brightwell Aquatics BacStart XLM Marine Starter Culture - 250ml

Brightwell Aquatics BacStart XLM (MicrōBacter Start XLM) is a professional-grade, 15× strength live nitrifying starter culture engineered for rapidly cycling marine fish, reef, and brackish aquariums. This ultra-concentrated formula is designed to establish biological filtration extremely fast, often achieving effective cycling in around 7 days when used as directed.

Ideal for new aquarium startups, emergency recovery, overcrowded systems, or after major maintenance, BacStart XLM quickly eliminates toxic ammonia and nitrite through the action of non-pathogenic live nitrifying bacteria. Compared to competing starter cultures, it offers superior temperature tolerance and shelf stability, making it a dependable solution for both hobbyists and professional reef systems.

Key Features:

• 15× concentrated LIVE nitrifying bacteria for rapid aquarium cycling
• Quickly reduces toxic ammonia and nitrite
• Helps prevent “New Tank Syndrome” in new aquariums
• Ideal for marine, reef, and brackish systems
• Excellent for emergencies, filter crashes, or overcrowding
• Re-establishes nitrifying bacteria after cleaning rock, substrate, or media
• Can be safely overdosed up to 5× during aquarium emergencies
• Proprietary suspension base for extended shelf life and stability
• Developed using extensive microbiological research

Brightwell Aquatics BacStart XLM 250ml is a high-performance marine starter culture designed for fast, reliable biological filtration. Whether you are cycling a new aquarium, recovering from a bacterial crash, or adding fish to a heavily stocked system, this powerful 15× strength live bioculture delivers rapid ammonia control and long-term system stability. A trusted solution for reef keepers who demand professional results and fast turnaround.