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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🌿 Keep your aquatic garden thriving with the sharpest CO2 insight!

PREMIUM GLASS BUILD - Durable, transparent glass ensures long-lasting, precise monitoring without guesswork
FAST ACCURATE READINGS - Get dependable CO2 levels in your aquarium within 2 hours—no syringes needed
INTUITIVE COLOR INDICATOR - Green means perfect CO2 balance; yellow signals excess; blue warns of deficiency
ESSENTIAL FOR PLANT HEALTH - Maintain optimal CO2 to keep your aquatic plants thriving and your tank vibrant
COMPLETE CO 2 MONITORING KIT - All-in-one set with glass checker, suction cup & reagent solution for effortless setup

The NilocG Aquatics Glass CO2 Drop Checker Kit offers the fastest and most accurate way to monitor carbon dioxide levels in planted aquariums. Featuring a premium glass drop checker, a suction cup for easy placement, and a 60ml 4dKH/pH reagent solution, it delivers clear color-coded readings within 2 hours—ensuring your aquatic plants receive optimal CO2 for healthy growth.

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Pet Type	Aquariums
Product Dimensions	12.19 x 8.64 x 8.38 cm; 112.83 g
Item model number	9902018
Item Form	Liquid
Color	Transparent
Size	3 Piece Set
Quantity	1
batteries required	No
Batteries Included	No
Item Weight	113 g

NilocG AquaticsGlass Co2 Drop Checker with 4dkh/PH Solution | Quickest, Most Accurate & Easiest to Use | | Glass Co2 Drop Checker with 4dKH/Ph Reagent Most Accurate Monitoring of Your Co2 Levels

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