Can we add this to an existing reef with slightly elevated ammonia?

If by existing you mean live stock in it? Yes, and if you mean no stock but ammonia, yes again. You might be better off doing a water change if you have life in tank though. If you dose this you will have to monitor nitrite and nitrate cycles.

Im new...will this kill off my invert food sources or hurt them in any way?

It will not kill your invert food source. It’s bacteria that’s beneficial to your aquarium

Noob question how much of this do I use on a 32 gallon biocube? It’s a new tank I can’t find any measuring cups for ML anywhere n my town

Once your tank has been fed regularly for a few days either with out without fish to start the bacterial cycle, add half during the first week and the other half during the 2nd. Add a small amount after water changes is also a good idea for upkeep. Buy 2 bottles.

how long did it take for this product to bring down nitrite levels?

I wouldn't use this product as a means of nitrite reduction. Live rock will do a much better job of that. I use this product as a means of adding biodiversity to my tank. It did nothing for nitrate levels.

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MicroBacter7 Biological Filter Bioculture Aid, 2L

Product ID: 17725668

Details

Brand
Brightwell
Item Form
Liquid
Item Weight
16 ounces
Liquid Volume
2 liters
Unit Count
1 Count

💧2L liquid volume for lasting use

🦠7-strain microbial blend

🇺🇸Made in USA, premium quality

€ 164.40

Duties & taxes included

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Description

🧬 Elevate your aquarium’s ecosystem with microbial magic!

NUTRIENT NINJA - Accelerates nitrification & denitrification to keep ammonia, nitrite, nitrate, and phosphate levels in check.
MICROBIAL MASTERY - Harness a powerful 7-strain aerobic & anaerobic bacteria system for rapid water clarity.
CLEANER CLEARER WATER - Rapidly reduces organic waste and hydrogen sulfide, promoting a vibrant, healthy tank environment.
DUAL ECOSYSTEM SUPPORT - Optimized for both freshwater and marine aquariums—versatility that fits your aquatic lifestyle.
TRUSTED AMERICAN CRAFTSMANSHIP - Scientifically backed, veterinarian recommended, and proudly made in the USA for unmatched reliability.

Brightwell Aquatics MicroBacter7 is a 2L advanced microbial bioculture designed to enhance aquarium filtration by introducing a complex blend of aerobic and anaerobic bacteria. Suitable for both freshwater and marine tanks, it accelerates nutrient cycling, reduces harmful compounds like ammonia and hydrogen sulfide, and improves overall water clarity. Made in the USA and veterinarian recommended, it ensures a healthier, balanced aquatic environment.

Specifications

ASIN	B00412Z28S
ASIN	B00412Z28S
Allergen Information	Sulphites Free
Best Sellers Rank	#5,911 in Pet Supplies ( See Top 100 in Pet Supplies ) #40 in Aquarium Water Treatments
Brand Name	Brightwell Aquatics
Customer Reviews	4.7 4.7 out of 5 stars (3,536)
Date First Available	October 31, 2008
Global Trade Identification Number	00810086012213
Included Components	MicroBacter7
Item Form	Liquid
Item Type Name	Aquarium Bacteria
Item Weight	16 ounces
Item model number	BAC2L
Liquid Volume	2 liters
Manufacturer	Brightwell Aquatics
Manufacturer	Brightwell Aquatics
Manufacturer Part Number	BAC2L
Model Number	BAC2L
Number of Items	1
Pet Type	Fish
Product Dimensions	2.75 x 6.25 x 8 inches; 1 pounds
Target Species	Fish
UPC	810086012213
Unit Count	1 Count

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