i have a 10g tank and the api co2 booster liquid booster that i add in manually everyday. will this be good for monitoring the co2 lvls in my tank?

No. This is for measuring dissolved CO2 gas in the water. Products like API's CO2 Booster and Seachem's Flourish Excel contain a carbon source for plants, but they do not provide CO2 gas, so this drop checker will not be useful unless you run a CO2 system.

Where in the tank should it be placed? Opposite where the diffuser is?

Yes. Opposite to the diffuser. I have mine still attached to de glass from day one. Good suction cup provided.

No color change after 2 days of co2 injection. i've even bubbled my exhalation into the drop checker. stayed blue. any ideas?

I had an issue with one of these from another company. It ended up being the checker had a crack in it and was leaking tank water into in. But is doesn’t apply to you, maybe you can considered these questions...are you injecting enough Co2? Are you degassing to much Co2 during the photo period with too much surface agitation. When you insert the fluid in the checker make sure it doesn’t get diluted with water. Check your Ph....compare the degassed Ph to the Ph an hour or so after you start injecting. There should be a difference. Depending on your setup and goals, your Ph drop should be .8-1.3

Can i use the fluval indicator liquid for this? i saw a video of someone on youtube doing so.

I really don't know for sure, but my guess would be yes. This glass indicator is just a device to hold the fluid. If I had other fluid I would try it

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NilocG Aquatics Glass CO2 Drop Checker – CO2 Monitor Kit for Aquarium Tank – Functional and Reliable – Transparent Drop Checker, 4dkh/pH Reagent Solution and Suction Cup

Product ID: 253773406

Details

Brand
NilocG
Item form
Liquid
Item weight
4 Ounces
Liquid volume
60 Milliliters
Unit count
1 Count

📏2-hour reliable color-change reading

🔍Glass drop checker for precise CO2 monitoring

🧪60ml 4dkh/pH reagent solution

A$35

Duties & taxes included

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Description

🌿 Keep your aquarium thriving with precision CO2 monitoring—because your plants deserve the best!

INSTANT VISUAL FEEDBACK - Color-coded indicator (green = optimal, yellow = high, blue = low) for quick, confident aquarium care decisions.
DURABLE TRANSPARENT DESIGN - High-quality glass ensures clear visibility and long-lasting performance, making it a must-have for serious aquarists.
ALL IN ONE CO 2 MONITORING KIT - Includes premium glass drop checker, suction cup, and 60ml reagent solution for effortless setup.
EFFORTLESS ACCURATE READINGS - Get reliable CO2 level insights in just 2 hours—no syringes or complicated tools needed.
VITAL FOR THRIVING AQUATIC PLANTS - Maintain perfect CO2 balance to boost plant health and create a lush, vibrant underwater ecosystem.

The NilocG Aquatics Glass CO2 Drop Checker Kit is a complete, easy-to-use solution for monitoring carbon dioxide levels in aquarium tanks. Featuring a high-quality glass drop checker, a 60ml bottle of 4dkh/pH reagent solution, and a suction cup, it delivers accurate, color-coded readings within 2 hours. This essential tool helps maintain optimal CO2 levels, ensuring healthy aquatic plants and a balanced ecosystem.

Specifications

ASIN	B01MY87WVP
Best Sellers Rank	#49,966 in Pet Supplies ( See Top 100 in Pet Supplies ) #4,006 in Aquarium Accessories
Brand Name	NilocG Aquatics
Customer Reviews	4.5 4.5 out of 5 stars (1,930)
Included Components	Co2 drop checker set
Item Form	Liquid
Item Weight	4 Ounces
Liquid Volume	60 Milliliters
Manufacturer	NilocG Aquatics
Manufacturer Part Number	9902018
Model Number	9902018
Number of Items	1
Pet Type	Fish
Target Species	Fish
UPC	702921923573
Unit Count	1 Count

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