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⚡ Ignite your marine tank’s health with science-backed speed!
Brightwell Aquatics MicroBacter Start XLM is a 125 ml, 15x concentrated liquid bacterial supplement designed to rapidly establish and maintain biological filtration in marine and brackish aquariums. It accelerates nitrifying bacteria colonization, cycling tanks in as little as 7 days, while reducing harmful ammonia and nitrite levels—ideal for new setups, high-density tanks, and post-medication recovery. Made in the USA with a proprietary formula ensuring shelf stability and maximum efficacy.
| ASIN | B083W4N1T3 |
| Allergen Information | Sulphites Free |
| Best Sellers Rank | #24,347 in Pet Supplies ( See Top 100 in Pet Supplies ) #209 in Aquarium Water Treatments |
| Brand | Brightwell Aquatics |
| Brand Name | Brightwell Aquatics |
| Customer Reviews | 4.5 out of 5 stars 861 Reviews |
| Global Trade Identification Number | 00810086019502 |
| Included Components | MicroBacterStart XLM |
| Item Form | Liquid |
| Item Type Name | Aquarium Bacteria |
| Item Weight | 4.97 Ounces |
| Liquid Volume | 125 Milliliters |
| Manufacturer | Brightwell Aquatics |
| Manufacturer Part Number | BACSTARTXLM125 |
| Model Number | BACSTARTXLM125 |
| Target Species | Fish |
| UPC | 810086019502 |
| Unit Count | 1 Count |
L**S
Very good for water quality
Keeps the tank in good shape
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.
M**W
Great
This will always be my go-to from now on. Works like a charm
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
K**N
Amazing stuff
I tried a product from a big store and it did not cycle my tank. This product works excellent however, highly recommended.
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
3 days ago
3 weeks ago