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

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Details

Brand
Brightwell
Liquid volume
125
Item weight
0.32 Pounds
Item form
Liquid
Manufacturer
Brightwell

⚡Rapid organic waste breakdown

🌿Boosts photosynthetic nutrient cycle

💧Increases dissolved oxygen levels

Description

💧 Elevate your aquarium’s ecosystem — cleaner, greener, and thriving like never before!

HYDROGEN SULFIDE NOT HERE - Significantly cuts harmful hydrogen sulfide production for a safer tank environment.
ECO FRIENDLY WASTE DIGESTION - Breaks down uneaten food and detritus, keeping substrates pristine and healthy.
OXYGENATE YOUR UNDERWATER WORLD - Elevates dissolved oxygen, promoting vibrant aquatic life and reducing toxic buildup.
TURBOCHARGE AQUARIUM CLEANLINESS - Swiftly eliminates ammonia, nitrite, nitrate & phosphate for crystal-clear water.
NUTRIENT BOOST FOR PHOTOSYNTHESIS - Transforms organic compounds into essential nutrients, fueling lush aquatic plant growth.

Brightwell Aquatics MicroBacter7 is a powerful liquid bio-enhancer that rapidly reduces harmful organic compounds and toxins in aquariums. By digesting waste and boosting dissolved oxygen, it creates a cleaner substrate and healthier environment, while promoting nutrient cycling for photosynthetic organisms. Ideal for maintaining crystal-clear water and vibrant aquatic life.

Specifications

Product Dimensions	13.03 x 4.14 x 4.14 cm; 145.15 g
Item model number	BAC125
Item Form	Liquid
Quantity	1
Batteries required	No
Batteries Included	No
Item Weight	145 g

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TrustScore 4.5 | 7,300+ reviews