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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Brightwell Aquatics MicroBacter7 Biological Filter Bioculture Aid, 500 ml

Product ID: 7737163

Details

Brand
Brightwell
Item Form
Liquid
Item Weight
1 Pounds
Liquid Volume
500
Number of Packs
1

💧Rapid water clarity boost

🦠7-strain microbial blend

🇺🇸Proudly USA-made quality

Rp959797

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Description

🦠 Elevate your aquarium’s ecosystem with microbial magic!

MICROBIAL MASTERY - Harnesses a complex system of aerobic & anaerobic bacteria for superior filtration.
AMERICAN EXCELLENCE - Crafted in the USA by Brightwell Aquatics, a leader in innovative aquarium solutions.
DUAL ECOSYSTEM SUPPORT - Optimized for both freshwater and marine aquariums—versatility meets performance.
SCIENTIFICALLY ENDORSED - Veterinarian pathologist tested formula ensures trusted, reliable aquatic care.
CRYSTAL CLEAR CONFIDENCE - Rapidly reduces ammonia, nitrite, nitrate, phosphate & organic carbon for pristine water.

Brightwell Aquatics MicroBacter7 is a 500 ml advanced microbial bioculture designed to enhance aquarium filtration and water quality. Featuring a unique blend of aerobic and anaerobic bacteria plus natural enzymes, it accelerates nitrification and organic waste breakdown, reducing harmful compounds like ammonia and phosphate. Suitable for both freshwater and marine tanks, this USA-made formula is veterinarian tested and trusted to create a cleaner, healthier aquatic environment.

Specifications

Asin	B001DKSG9S
Best Sellers Rank	#52 in Aquarium Water Treatments
Date First Available	June 24, 2004
Is Discontinued By Manufacturer	No
Item Model Number	BAC500
Manufacturer	Brightwell Aquatics
Product Dimensions	2.5 x 2.5 x 6.75 inches; 1 Pounds

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