Your cart is empty.
Your cart is empty.Sera CO2 tablets for sera CO2-Start. CO2 is the basic plant nutrient and allows adjusting a lightly acidic pH value, as it is preferred by many plants and fish.
Klaus Hüttner
Reviewed in Germany on March 3, 2025
Funktioniert wie angekündigt starker Co2- Strahl.
Belinda
Reviewed in Belgium on March 5, 2024
gebruik deze al zeer lang hoop dat ze in de handel blijven visjes zijn tevreden
Tamás Czimmermann
Reviewed in the United States on February 8, 2024
Never do any CO2 injection without monitoring.It is also important that you understand the mechanism and speed of the CO2 indicator in the glass. The indicator reacts slowly (~2hours). Read the manual.I put two tablets into a 40gallon tank with many plants and in 1.5houts it turned green. Everybody is happy. Good stuff.
Muraki TTM
Reviewed in the United States on September 12, 2022
Many people say that carbon dioxide ingots are useless! I doubt it, but it's a German sera product and I'm trying to buy and use it. Because it is a famous brand of a big factory, it will not be produced casually. I want to talk about products; The dosage on the instruction manual! If you use it according to it, you will lose your expectations. Let's put it this way! I take my pills, but I don't have a CO2 monitor! Therefore, it is not clear whether the carbon dioxide in the fish tank is present or sufficient, or how it exists!This time I use the monitor, and I can see that it is blue liquid! Verify that there is no carbon dioxide in the fish tank, even the pills put in earlier! I'll put a piece first and pay attention to the change of the monitor. It didn't change at first, but after a while, I noticed that the liquid in the monitor changed slightly from dark blue! I suspected I was wrong, I suspected ❓ in my heart, so I put the second tag in, but I couldn't help putting the third tag in! At first, nothing seems to have changed! However, after a while, I didn't look, looked at the monitor again, and found that it turned green! Yes, it's definitely green! Pay attention to the monitor in the photo. There is no water in the blue pipe, but there is water in the green pipe! Verify that the carbon dioxide gas in the fish tank has entered the monitor!The problem is, according to the factory dose, it is not necessarily correct! And it depends on whether you use it every day or every other day or two! I use 40-60 liters of water to calculate, a bottle has 20 carbon dioxide ingots, how many bottles should I buy in that month! If you don't use it every day, pay attention! I didn't notice when the monitor fluid turned blue. Therefore, we have to measure the dose and whether to use it every day! With the extension of light irradiation time, whether to invest a certain dose and wait for a period of time before starting light irradiation time! This should be observed by oneself, how to control it! I can say for sure that this carbon dioxide ingot is effective!
Cherish
Reviewed in the United States on June 5, 2021
I bought these after an absolutely total junk C02 tablet that did nothing.Now then.This is a 30 gallon heavily planted tank it took 3 tabs to get the drop checker to turn green.However one tab did in fact turn it a little green i thought I was crazy or it was the light. However after adding 2 more into just the hang on filter in 2 hours and 40 mins I looked again and it was clearly green.If you do not have a drop checker for your tank do not use any form of C02 as it can kill your fish and plants.So is 3 ever day or every other day for me worth not having to mess with C02 DIY or the problem of exploding tanks for me yes. This is cheap even with 3 a day id happily pay them a month if I needed to.Im honestly amazed at how well this works.
CDear
Reviewed in the United States on June 12, 2021
Works well. I have a lily pad plant that was doing nothing and then I started using these tablets and it jas started growing very fast. And all my other plants look greener than they did.
Jessica L
Reviewed in the United States on December 20, 2021
Replacement tabs. They do help my plants, but I found the co2 levels to be more inconsistent which causes more algae growth. The inconsistency is worse if you drop tabs in themselves rather than using the sera system as directed.
jaf
Reviewed in the United States on January 14, 2021
Its nice to buy something that is not from China. I'm happy to spend a little more for higher quality
Customer
Reviewed in the United Kingdom on September 6, 2020
They released lots of Co2 but released it extremely quick so not really good for my requirements of adding Co2 to a grow room for hot chillys and various herbs it just got pulled out with the air exchanger in a matter of minutes where I needed it to be a more steady stream of bubbles, not its intended use I no but hoped it would be a cheap alternative to an expensive Co2 generator.
Biswajit khuntia
Reviewed in India on March 4, 2020
Good
Seth
Reviewed in the United States on August 5, 2019
It didn't seem to work like I thought it would
Jose Luis
Reviewed in Spain on July 5, 2019
Me gusta: La facilidad de uso y eficacia. Se lo meto en el bote de JBL con un poco de agua y veo como van saliendo despacio las burbujas de co2, en caso de tener alguna urgencia. Por olvido de echarlo, etc.No me gusta: De momento ninguna queja.Lo tengo para urgencias para cuando se me olvida rellenar el CO2, le meto la pastilla en el bote de JBL y es una maravilla. No me ha defraudado nunca. Lo seguiré comprando
EMAE29
Reviewed in the United States on June 17, 2018
Keeping my plants supplied very well. Works for my tank load (40g). Recommend!
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