







⚡ Dive into a thriving aquarium ecosystem—fast, fierce, and flawless!
Brightwell Aquatics MicroBacter Start XLM is a 15x concentrated liquid bacterial starter designed to rapidly establish and maintain biological filtration in saltwater aquariums. It accelerates nitrifying bacteria colonization to cycle tanks in as little as 7 days, effectively reducing ammonia and nitrite levels even in high-density marine environments. Ideal for new setups, post-cleaning recovery, or after medication use, this American-made formula supports a stable, healthy aquatic habitat for all life stages.




| ASIN | B082BWNQ37 |
| Allergen Information | Sulphites Free |
| Batteries Included | No |
| Best Sellers Rank | #39,837 in Pet Supplies ( See Top 100 in Pet Supplies ) #351 in Fish Medication & Health Supplies |
| Customer Reviews | 4.6 4.6 out of 5 stars (729) |
| Date First Available | 14 December 2019 |
| Item Form | Liquid |
| Item Weight | 281 g |
| Item model number | BACSTARTXLM250 |
| Number of Items | 1 |
| Pet Life Stage | All Life Stages |
| Product Dimensions | 3 x 3 x 12 cm; 281 g |
| Quantity | 1 |
| Size | 250-ML |
| Specific Uses | fish |
| batteries required | No |
K**S
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**.
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.
M**.
I used this product to speed up my fish tank cycle. It did a good job and dropped Amonia to zero really quick
T**.
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
K**N
I tried a product from a big store and it did not cycle my tank. This product works excellent however, highly recommended.
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