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Brightwell Aquatics MicroBacter Start XLM is a 15x concentrated nitrifying bacteria solution that rapidly establishes biological filtration in saltwater aquariums. Designed to cycle tanks in as little as 7 days, it effectively reduces ammonia and nitrite levels, supports high-density fish populations, and accelerates recovery after tank maintenance or medication. Made in the USA, this shelf-stable formula ensures a vibrant, healthy marine environment for both new and established aquariums.









| ASIN | B082BWNQ37 |
| Allergen Information | Sulphites Free |
| Best Sellers Rank | #27,035 in Pet Supplies ( See Top 100 in Pet Supplies ) #227 in Aquarium Water Treatments |
| Brand | Brightwell Aquatics |
| Brand Name | Brightwell Aquatics |
| Customer Reviews | 4.5 out of 5 stars 869 Reviews |
| Global Trade Identification Number | 00810086019519 |
| Included Components | MicroBacter-StartXLM |
| Item Form | Liquid |
| Item Type Name | Aquarium Bacteria |
| Item Weight | 0.28 kg |
| Liquid Volume | 250 ml |
| Manufacturer | Brightwell Aquatics |
| Manufacturer Part Number | BACSTARTXLM250 |
| Model Number | BACSTARTXLM250 |
| Number of Items | 1 |
| Pet Type | Fish |
| Target Species | Fish |
| UPC | 810086019519 |
| Unit Count | 1 Count |
R**R
Great product for saltwater fish!
Helps cycle your tank, with saltwater fish aquarium. Good for starting up new tanks & anytime you do a water change, it helps keep the bio load good.
R**Y
Works great for the saltwater tank
Easy to use!
T**.
Help the tank cycle fast
This is a great product I used to start my nano reef aquarium my tank cycle in 10 days with living sand and a couple pieces of live rock. I highly recommend this for anyone starting a new tank
L**S
Very good for water quality
Keeps the tank in good shape
M**W
Great
This will always be my go-to from now on. Works like a charm
T**L
Works Great
We bought some of this for our 140 Gallon system and some for our 20 Gallon Quarantine system. They are quick and do a great job of cycling the tank.
M**.
It just works
I used this product to speed up my fish tank cycle. It did a good job and dropped Amonia to zero really quick
K**S
works great
I used this to start a new tank a year ago and was pleased with the results. Biofiltration is the most important to reef success.
D**.
Does Not Work
Followed all instructions (dry sand, Marco rock etc together with Rapid Cycle from Brightwell) but after four weeks NH3 was still 0.05ppm and Nitrate was only 5ppm. Tank has not cycled in 1 month let alone their claimed 7 days. Have now given up with Brightwell - added live sand and rock and Dr Tims. Hopefully this will work.
Trustpilot
2 weeks ago
2 months ago