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: 40832984

Details

Brand
NilocG
Item Form
Liquid
Item Weight
4 ounces
Liquid Volume
60 ml
Unit Count
1 Count

📏Compact 4.8x3.4x3.3 inch size with suction cup

🔍Glass drop checker for precise CO2 monitoring

🧪60ml 4dkh/pH reagent solution

¥5344

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Description

🌿 Keep your aquatic garden thriving with precision CO2 control!

FAST RELIABLE READINGS - Get accurate CO2 levels in just 2 hours—no syringes or complicated tools needed.
VISUAL CO 2 LEVEL INDICATOR - Color-coded solution changes from blue to green to yellow, so you always know your tank’s CO2 status at a glance.
DURABLE TRANSPARENT DESIGN - High-quality glass ensures clear visibility and long-lasting performance, blending seamlessly into any aquarium.
ALL IN ONE CO 2 MONITORING KIT - Includes premium glass drop checker, reagent solution, and suction cup for effortless setup.
ESSENTIAL FOR THRIVING AQUATIC PLANTS - Maintain optimal CO2 to boost plant health and create a 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, 60ml of 4dkh/pH reagent solution, and a suction cup for secure placement, it delivers reliable, color-coded CO2 readings within 2 hours. Designed to support healthy aquatic plants, this compact and transparent kit is an essential tool for any planted aquarium enthusiast.

Specifications

ASIN	B01MY87WVP
ASIN	B01MY87WVP
Best Sellers Rank	#53,289 in Pet Supplies ( See Top 100 in Pet Supplies ) #81 in Aquarium Test Kits
Brand Name	NilocG Aquatics
Customer Reviews	4.4 4.4 out of 5 stars (2,013)
Date First Available	January 13, 2017
Included Components	Co2 drop checker set
Item Form	Liquid
Item Weight	4 ounces
Item model number	9902018
Liquid Volume	60 ml
Manufacturer	NilocG Aquatics
Manufacturer	NilocG Aquatics
Manufacturer Part Number	9902018
Model Number	9902018
Number of Items	1
Pet Type	Fish
Product Dimensions	4.8 x 3.4 x 3.3 inches; 4 ounces
Target Species	Fish
UPC	702921923573
Unit Count	1 Count

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¥5344

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

View all Trustpilot reviews