Seachem Flourish Review: A Good Companion For Fishtank?

Taking care of an aquarium is not easy. In addition to the condition of the fish in the tank and the water environment, we need to pay attention to aquatic plants. In this Seachem Flourish review, we will recommend you an excellent fertilizer as well as related information about this product.

Just like plants on land, aquatic plants also need nutrients to survive and grow. Without enough nutrients, the plant will turn pale and die immediately. Therefore, we also need to fertilize aquatic plants. 

However, choosing the right fertilizer to suit the plants as well as the fish living in the tank is very difficult. Because if the fertilizer is not suitable, it will prevent plants from growing and cause the water environment to change, leading to fish death. 

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Seachem Brand And Flourish’s Functions

Seachem is a company specializing in the production of fertilizer products for aquatic plants. The aquatic environment and the plants in the aquarium will grow actively, thanks to Seachem’s advanced products. 

This brand is especially famous for its Seachem Purigen product, making aquascape clear and free of impurities.

Flourish is a line of fertilizer products that provide nutrients for aquatic plants in general. Each product contains a high content of assortment, in other words, important microelements and various particles to boost plant growth. 

These supplements include magnesium, iron, calcium, phosphorus, and other necessary factors, helping your aquatic plants to develop more sustainably.

You can use Flourish along with other nutrient supplements for micro and macro. This is much more convenient in case you target a specific element for plants and do not want them to be overdosed by other nutrients combined in a product.

The manufacturer claim that these fertilizers contain: Protein Hydrolysates, Chloride, Calcium Chloride, Cobalt Sulfate, Copper Sulfate, Magnesium Chloride, Boric Acid, Magnesium Sulfate, Ferrous Gluconate, Manganese Sulfate, Sodium Molybdate, Potassium, and Zinc Sulfate.

The Seachem brand

The Seachem brand

Bottles’ Sizes Available On The Market

Seachem Flourish has a total of 5 different volume bottles to suit a variety of uses. They offer products in small to large volumes of 50ml, 100ml, 250ml, 100ml, and 2000ml. 

Of course, you can choose whatever you want, but it is advisable that you purchase the size that you use up in 3 months after you open the cap. The cap is somehow loose, so after three months, the company recommends keeping it refrigerated.

A 500ml bottle

A 500ml bottle

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Ingredients The Flourish Contains

Seachem Flourish has proved itself to be the leading brand of providing micro-nutrient aquatic fertilizers. The manufacturer guarantees that in each product, there will be the following percentages of substances, according to reports published by the brand:

Phosphate (P2O5) 0.01%

Nitrogen (N) 0.007%

Magnesium (Mg) 0.11%

Soluble Potash (K2O) 0.37%

Calcium (Ca) 0.14%

Boron (B) 0.009%

Sulfur (S) 0.2773%

Molybdenum (Mo) 0.0009%

Chlorine (Cl) 1.15%

Cobalt (Co) 0.0004%

Copper (Cu) 0.0001%

Manganese (Mn) 0.0118%

Iron (Fe) 0.32%

Zinc (Zn) 0.0007%

Sodium (Na) 0.13%

Copper is included in the ingredient list, making potential customers somewhat apprehensive about the product. Because copper is harmful to invertebrates, and shrimp is one of them. 

Moreover, the product also includes Phosphate, a compound that supports the growth of algae. However, as mentioned above, these two substances are very small compared to their overall composition, so the product does not harm invertebrates or stimulate algae growth. 

If you take 1000 times the recommended dose, the above negative effects may occur. Plus, despite adding a lot of different nutrients to the plants, the product does not affect the pH balance in the aquarium environment. This is very helpful for the development of aquatic species or fish that are sensitive to pH levels. 

Features And Benefits 

Promotes Plants’ Growth

The product’s special feature is that it contains phytohormone molecules, enhancing growth, especially for aquatic plants. Besides supporting normal development, it helps to develop plant roots, accelerates cell division for plants to grow faster. 

In addition, it also distributes nutrients in the plant more evenly and stabilizes seed germination. It also contains a wide range of nutrients that can help your aquatic plants thrive, nurture, and protect themselves as they grow.

Furthermore, there are no nitrate ingredients in this fertilizer. Although it is beneficial to plants, it is not suitable for fish.

Improve Plant’s Growth

Improve Plant’s Growth

Unique Formula

Using this Flourish product regularly, you will see some noticeable changes in your plants. All thanks to its innovative formula that supports the absorption of minerals and strengthens the plant’s resistance to disease, their condition will be better in just 10 to 15 days of use.

The product’s purpose is to reduce the quantity of iron in the water. It also improves and retains the level of ferrous iron in the planted tank simultaneously. The component ferrous iron is essential for the life of plants. 

In particular, the formula also supports the development of plant roots below the surface. In the first stage of fertilizer application, nutrients will nourish the leaves and stems. 

The nutrients in the product will be easier to absorb than conventional planting. Flourish fertilizer is safe for all aquarium elements, including all types of fish, plants, and organic organisms.

The plants will grow better

The plants will grow better

Organic Carbon

Although there are no substances such as nitrogen, phosphorus, and potassium, the product does contain a very important compound, organic carbon. All plants, especially aquatic ones, cannot survive without this substance. 

If your aquarium is suffering from an organic carbon deficiency, you need to replenish it immediately. Carbon dioxide frequently contains organic carbon. In addition to maintaining plant life, this substance also aids in killing algae, bringing about a bright, crystal clear aquarium. 

However, you also need to adhere to the dosage to avoid causing adverse effects for the aquarium. The fewer algae, the more nutrients the aquatic plants receive.

Flourish brings to you a clean fish tank

Flourish brings to you a clean fish tank

Seachem Flourish Review: Pros And Cons 

This is a fertilizer product that helps to develop aquatic plants comprehensively. In addition to replenishing the missing substances, it also supports the roots, leaves, stems. Plus, it is excellently compatible with almost all types of plants and fish.

Furthermore, the product also provides organic carbon for plants, so you will see their progress after only a short time.

The Flourish fertilizer set comes from the Seachem brand, a globally famous brand with products for aquatic plants. With many positive feedbacks and proven modern technology, customers will feel more secure when choosing these fertilizers.

A disadvantage of this fertilizer is that it does not integrate all the nutrients in one product but separates them. Customers will have to buy more fertilizers, and it will be a bit inconvenient during use because they have to interact with them many times. 

In addition, as mentioned above, the product does not include nitrogen, phosphorus, and potassium, so customers must buy fertilizer from another brand if needed. Plus, the copper and phosphate content is small but still makes users worry.

To sum up this part, we have listed out below:

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  • Completely safe for creatures living besides aquatic plants
  • Develop excellent strength and health of plants 
  • Can eliminate almost all exceeded algae in the aquarium
  • Contain organic carbon necessary for aquatic plants
  • Compatible with other nutritional supplements


  • A small amount of phosphate and copper, harmful to invertebrates
  • Not contain macronutrients (nitrogen, phosphorus, and potassium)
  • Boost algae growth when overdose
  • Inconvenient operation when using multiple fertilizers


So you have finished our Seachem Flourish review. Overall, this is a very good product that you should buy if you have an aquarium. It will help plants grow healthier without harming the organisms living in the tank.

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