Fluval CO2 Indicator Kit

The design makes it very easy to read and looks pretty cool and modern.

Basically this is how this product works.

1. Remove the cap and put 1ml of the included solution inside (Fill up to the line, pretty simple).

2. Put the cap back on the base (with suction cup) and slowly flip it so the point is now facing up.

3. Place inside the aquarium, preferably somewhere where no air bubbles may become trapped underneath, ruining the results.

4. Give it a few hours to get the correct reading initially.

Few placement tips:

-Again if air bubbles are being trapped underneath from a co2 air stone(etc) or just a regular air stone it will cause inaccurate results.

-Try to place it 4-5 inches from the top of the aquarium, in a spot where you can clearly see the colour.

-Make sure your tank has good water movement to ensure accurate results

It says the solution lasts 2-4 weeks which is somewhat vague. I guess I would replace the solution every 3 weeks?

It also only includes 10ml of solution so this wont last that long. Around 6-8 months probably

This is a great little tool to tell if your plants are getting enough CO2 . It will not tell you ph or kh and those must be monitored separately.

Overall if you don't mind getting a replacement solution every few months, this works great, and is the best at what it does.

Although not as "pretty" as a fancy glass drop checker, this doesn't look bad at all once it's in the aquarium, and the premixed indicator solution makes it foolproof to use. Just squeeze in the indicator solution up to the line (the bottle has enough for at least 3 refills) and you're ready to go--no need to mix up a reference solution, etc etc.

Superbly convenient and the indicator solution seems to perform well for at least 6 weeks for me. It's accurate enough to show me daily variation in CO2 and showed me clearly when I was over the top with gas--as verified by an algae explosion. I now keep the indicator showing a nice deep to Kelly green during the day, and growth is spot on with algae in check.

A good buy!

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Great visual check of CO2 levels. Indicator fluid need changed about every 2-3 weeks in my 29g. After changing the indicator fluid it takes several hours for it to acclimate not minutes. Good seal on the cone. I highly recommend this because it works as it should.

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easy product to use. just fill it turn it upside down and stick it on the wall of the tank. reading the co2 range is easy yellow is too high green is just right and blue is too low.

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Great product that is very easy to use. Monitors for about a month and then re filled with reserve fluid bottle included. Much less $$$ than electronic testers.