Neutro CO2 Liquid Carbon - Medium

  • Stock: 194 units in stock
  • Dimensions: 1000ml
  • Model: NLCM
Qty :

Better together


Neutro CO2 is a liquid source of carbon for the planted aquarium.

For those of you not familiar with it, carbon is essential for all healthy plant growth and can be provided via gas, or  liquid. The liquid form is not as potent as the gas but is still very effective. It won't make your plants pearl (this is when you see O2 bubbles coming from the plant) but it will help them grow. Plants that have access to liquid carbon will do far better than those without.

In addition to this, if you over dose Neutro CO2, it can have a negative effect on algae (it helps reduce it). However you need to take care when overdosing, and increase it slowly. Perhaps 25% extra, then monitor the results. We do not recommend more than double dose.

It is also possible to spot treat plants or wood that have algae growing on them. Simply by using a pipette and extracting some Neutro CO2, squirt the carbon onto the plant or wood when it is outside of the water. Wait for 10 seconds then put it back into the water. You can also do this when performing a water change (it's easiest that way). But if you leave liquid carbon on for too long you will kill the plant.

DIRECTIONS: Add 5ml per 250L every day. It doesn't matter what time of day you dose this product, but it does need to be added every 24 hours.

Bottle sizes: Small = 500ml,  Medium = 1000ml,  Large = 2000ml, XLarge = 4000ml.

This bottle has a cap which measures 10ml. In order to dose you can pour directly into that or use one of our dispensing bottles (which is on the better together promotion on the right hand side of the screen).

by Peter C. on 4/3/2021

my recently installed plants showed little sign of growth, after purchasing this product and its accompanying fertilizer, health and growth of plants has been phenomenal

by Steve H. on 2/3/2021

Since using this product, my plants look more healthy now than when I was using pressurised co2 bottle, also I had a lot of BBA algae, but since using this it's all gone and my Nitrate levels have also dropped to a suitable level. I would recommend using this product.

by Stewart H. on 18/2/2021

If you cant be bothered with CO2 gas ,this is the next best thing and cheaper.

by Derek S. on 7/2/2021

Been using this in combination with Neutro T fertiliser. I have eased off it's application atm as there seems to be an increase in algae bloom.

by Brenda H. on 5/2/2021

Have only been adding this to my new set up for fancy goldfish for about 2-3 weeks now and together with the neutro fertiliser. I wanted to get the plants settled in the tank before adding any fish and this has worked perfectly! The plants have visibly started to grow extremely well and we have a running joke about one of the bulbs that is "walking" around the tank! The leaves have grown so well that it can't anchor, the roots are growing but much slower, the leaves are like sails! Every day they are longer and the plant is in a different place!

by JAMES S. on 16/12/2020

very impressed with the product, does what it say,s

Ask a question about this product
Every time i use Neutro the water goes a litlle bit cloudy. it takes about 24 hours to clear. is this normal? my tank 120L co2 i use 10ml every 24 hours sorry forgot about email

You must be using a buffer like RO right. This will create cloudiness with fertilisers with iron.

Hi,do your co2 liquid go out of date? If so when? (1000ml)

No they don't go out I date.

do i need to take any activated carbon out when using this product

In any planted aquarium, activated carbon needs to be removed

Hi, im starting to use the Neutro Co2. But the instructions are fairly vague about using it as an anti algacide. How much should i be dosing for a densly planted 60l aquarium ?

approx 1ml for a 60l tank per day.

Is this product known to affect Vallis in the same way that Flourish Excel does? Thanks you


Yes - all liquid carbons work in the same way

Can you use this product with red cherry shrimps?



Are there any plants or fish that you wouldn't use this product with?


Yes - vallis and riccia

Can I use Neutro T and Neutro CO2 in my 160 litre planted tank. If so, how much of each should I be dosing


Yes. Dosage is in description and on bottle.

Why do I need to remove my carbon from my planted tank if using this.


Because a carbon filter removes everything from the water

I have a fairly heavy planted 180ltr, 4wk old setup using your recommended Neutro T and Neutro CO2 at stated doses. Now green algae, was told not to worry as its a new setup and allow to settle but it’s getting worse. Interested that you’ve mentioned taking out the cabin in the filter. Will this help here? Any advise?


Green algae is definitely something to be concerned about as it shows an imbalance - I'd never say not to worry about it. Unless you change what you're doing your algae will get worse.

Dosage on the bottle is a guide and what you start at, NOT what you stay at. So I would increase Neutro T by 25% immediately. Leave Neutro CO2 dosage as it is because overdosing is generally not recommended.

Are you doing enough water changes? I'd say probably not because algae is already growing. By week 4 you should be doing a 30% water change every 4 days.

I assume you mean carbon in your filter? The best place for carbon is the bin as it's not suitable for planted aquariums - it absorbs all nutrients so what you are putting in isn't getting to the plants. Another reason for algae growing.

Lastly you don't mention lighting. Maximum lighting duration should be 8 hours and if you have algae drop down to 6 and make sure you have lots of algae eating shrimp (Amano shrimp). You need 1 per 5L of water.

Does this product contain Glutaraldehyde and if so is it dangerous to use?



not dangerous providing dosed as instructed. On A similar note paracetamol is also dangerous unless taken as recommended. So don’t be concerned - this product is excellent, works to treat and is perfectly safe.

I'm confused about how liquid carbon can help reduce algae. Algae are a form of plant - correct? Carbon makes plants grow so how does it reduce algae?


It skims the top layer of the plant off which is where algae lives. Hence adding too much negatively effects plants.

Does using a CO2 diffuser also have this effect?



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