Sera CO2 Start Kit.
**** PRODUCT MANUAL ****
Carbon dioxide (CO2) is the basic nutrient for plants. A well-dosed addition of CO2 also allows you to adjust the water to a slightly acidic pH range, which is preferred by most plants and fish kept in aquariums. sera start, our economically priced CO2 fertilization system requires no gas bottle, and is easy-to-install and convenient to use.
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Noticing results after 2 uses Review by nerdynoob
I have a 20 gallon long aquarium, eco complete substrate, med-high lighting and I also dose with liquid co2. I started this hobby 1 year ago and have "easy beginner" plants, so you can imgaine how disappointed I was when the only thing these plants did was look scraggley, instead of like the beautiful, lush, healthy aquatic plants I come across on Google. After 2 uses of this product I am starting to see signs of happy plants. new tiny leaves, Java moss is starting to fatten up. Things to be aware of when you use this product: YES you DO need the plastic diffusion reactor. The tablet disolves quickly in the diffusor and fills the plastic chamber up with CO2. You will notice the water level inside the chamber has lowered and air in its place. This air = the CO2. Over the course of about 6 or 7 hours you will notice the chamber slowly filling back up with water as the CO2 is slowly released into the aquarium water. Don't just buy the tablets by themselves and drop them into the tank. All that CO2 will be lost in seconds. Excellent product! (Posted on 7/17/2015)