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 125ml

Product ID: 121214898

Details

Brand
Brightwell
Item form
Liquid
Item weight
145 g
Liquid volume
125
Number of Packs
1

⚡Rapid organic waste reduction

💧Boosts dissolved oxygen

🧪Veterinarian-tested bioculture

MOP$402

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Description

💧 Elevate your aquarium game with science-backed clarity and vitality!

OXYGENATE LIKE A PRO - Significantly increases dissolved oxygen, promoting vibrant aquatic life.
VET APPROVED RELIABILITY - Formulated and tested by veterinarian pathologists for trusted performance.
TURBOCHARGE AQUARIUM HEALTH - Accelerates nitrification and denitrification for crystal-clear water.
CLEANER SUBSTRATE HAPPIER FISH - Breaks down uneaten food and detritus to maintain a pristine tank environment.
VERSATILE FOR FRESH SALTWATER - One solution for all aquatic setups, ensuring balanced ecosystems everywhere.

Brightwell Aquatics MicroBacter7 is a 125ml liquid bioculture designed to rapidly reduce harmful organic compounds like ammonia, nitrite, nitrate, and phosphate in both freshwater and saltwater aquariums. Vet-tested and proven to enhance biological filtration, it breaks down waste and boosts dissolved oxygen, resulting in cleaner substrates and healthier aquatic environments.

Specifications

ASIN	B01DBC0GD4
Best Sellers Rank	49,632 in Pet Supplies ( See Top 100 in Pet Supplies ) 512 in Aquarium Water Treatments
Brand	Brightwell Aquatics
Brand Name	Brightwell Aquatics
Customer Reviews	4.6 out of 5 stars 567 Reviews
Global Trade Identification Number	00810086014996
Item Form	Liquid
Item Weight	145 g
Item form	Liquid
Item weight	145 g
Liquid Volume	125 Millilitres
Liquid volume	125 Millilitres
Manufacturer	Brightwell
Manufacturer Part Number	BAC125
Model Number	BAC125
Number of Items	1
Number of Packs	1
Pet Type	Fish
Target Species	Fish and Plants
UPC	810086014996
Unit Count	1 count
Unit count	1 count

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MOP$402

Duties & taxes included

In stock

Sold byAmazon MacauDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Macau.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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