Seachem Flourish Excel 250ml (SC-456)


New product

  • Natural organic carbon
  • A great alternative to CO2 cylinders
  • Promotes plant photosynthesis
  • Reliable source of carbon for planted tank

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$ 14.40

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Brand: Seachem

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Seachem Flourish Excel 250ml

All plants require a source of carbon, which is why planted tanks require a reliable CO2 source. It is not enough to depend on atmospheric carbon dioxide to naturally dissolve at the water suface.

Seachem Flourish Excel is an excellent alternative to CO2 gas injection. Planted aquarium hobbyists will love the ease of supplementing their aquatic plants by simply adding Seachem Flourish Excel into the tank.

Flourish Excel contains natural organic carbon and is a reliable source of CO2 for planted tanks. The carbon is readily absorbed by plants for photosynthesis.

Bioavailable Carbon Source

The key benefit of Seachem Flourish Excel is that it is a source of bioavailable organic carbon for aquatic plants. The carbon molecules in Seachem Flourish Excel is readily absorbed by plants for photosynthesis benefits.


The benefits of Seachem Flourish Excel are:

  • Natural organic carbon
  • Ensures optimal photosynthesis in plants
  • Restores aquatic plants to healthy state
  • Ensures a beautiful planted aquarium
  • Non-toxic, safe for plants

CO2 for Planted Tanks

The reason plants need CO2 (carbon dioxide) is to produce longer chain carbon compounds also known as photosynthetic intermediates. Photosynthetic intermediates includes compounds such as ribulose 1,5-bisphosphate, and 2-carboxy-3-keto-D-arabinitol 1,5 bisphosphate.

Although the names are complicated, the structures are quite simple (5 carbon chains). Seachem Flourish Excel does not contain these specific compounds per se, but one that is quite similar.

By dosing with Seachem Flourish Excel, you bypass the involvement of CO2 and introduce the already finished, structurally similar compounds. It is in its structural similarity that Seachem Flourish Excel is able to be utilised in the carbon chain building process of photosynthesis.

Simple chemical or enzymatic steps can easily convert it to any one to any one of the above named compounds (or a variety of others).

How to Use

On initial use or after a major (> 40%) water change, use 1 capful (5 mL) for every 40 L (10 US gallons). Thereafter use 1 capful for every 200 L (50 US gallons) daily or every other day. For smaller dosing please note that each cap thread is approximately 1 ml.

Seachem Plant Supplements Online Shop

N30 is the authorised dealer in Singapore for Seachem plant supplements.

Order your Seachem plant supplements online today at

Seachem Guide

Which Seachem products do I need?

From treating fish infections to solving water and algae problems, Seachem has the right products to restore your aquarium.

Seachem - Fish Disease Treatment

A sick fish can spread infection quickly within an aquarium and threaten the life of other aquatic inhabitants. It is critical to accurately diagnose fish disease and dose the right medications as early as possible.

common fish diseases symptom guide - seachem medication guide

Seachem - Solve Aquarium Problems

Sometimes, a small change in water chemistry, alkalinity and acidity could cause problem for the aquarium. Below are some of the common problems:

  • Cloudy water
  • Algae over growing
  • Ammonia, nitrite, nitrate toxicity
  • Detritus or slime

Is your aquarium facing any of the above issues? If yes, use this guide to find the right Seachem products to restore your aquarium.

seachem products for common aquarium problems

About Expiration of Seachem Products

Many Seachem products do not have an expiration date by virtue of the ingredients used to make the products. Many mineral and non-organic components are shelf-stable, and do not have a finite shelf-life, and may be used for years with continued efficacy. If a product does not have a printed date of expiration, it can safely be assumed that the product does not expire.

expiration date of seachem products

About N30

About N30 Tank

N30 Tank Pte. Ltd. is a leading manufacturer of custom-made fish tanks cabinets. As a tank maker, we supply aquarium cabinets to homes and offices locally as well as ship orders worldwide.

N30 provides expertise in the construction of large acrylic aquariums, such as those in Underwater World (Resort World Sentosa). We supply customised storage tanks to fish farms such as Qian Hu, and to major restaurants. The N30 brand name is trusted for quality workmanship in the industry.

N30 has developed unique glass-sealing techniques, which allows us to produce very large tanks (such as 30-feet long) without issue of water leakage. For all custom-made fish tanks, N30 assures customers of Five Years Warranty against water leakage.

To support the needs of aquarium hobbyists, N30 is also offering a wide range of aquarium accessories such as filters, pumps, lighting, wave makers, skimmers... for sale online. We encourage customers to browse and shop online at for accessories. It is convenient and we provide free delivery for orders (see the online store terms and conditions for details).

Loyalty Points

Loyalty Points (N30 Member Rewards)

Earn 5 points per dollar

N30 members earn five points per dollar spent online at Each point is worth S$0.01 in cash value.

Convert points into eVouchers redeemable for discounts on your orders.

shopearn pointsredeem

When you purchase S$100 of aquarium accessories online at, you will earn 500 points in your N30 account. You may convert the 500 points into an eVoucher worth S$5. To use this eVoucher on your next order, simply enter the unique eVoucher code in your shopping cart before you check out. That's all!

The more you shop on, the more you will save on your next order!

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