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Seachem Laboratories Flourite Black Sand - 7Kilograms / 15.4 lbs


Item #: SC5233

Temporarily Out of Stock

Flourite™ is a specially fracted stable porous clay gravel for the natural planted aquarium. Its appearance is best suited to planted aquaria, but may be used in any aquarium environment. Flourite™ is most effective when used alone as an integral substrate bed, but it may be mixed with other gravels. Gravel modifiers such as laterite are not necessary. Flourite™ is not chemically coated or treated and will not alter the pH of the water. Although pre-washed, it should be rinsed before use to remove residual dust. Dust can also be minimized by filling tank slowly and dispersing water so that the Flourite™ bed is not disturbed. Slight initial cloudiness is normal and will clear rapidly (2–12 hours). This bag is sufficient for about a 5 cm (2 inch) deep bed in a typical 40 L (10 gallon) tank. Recommended use is 1 kg (2 lbs) for approximately each 200 cm2 (31 in2) of tank bottom at a depth of 5 cm (2 in).

Although planted aquariums are often considered to be too difficult for the beginning hobbyist, we believe that planted aquaria are actually ideal for the beginner. With the right substrate the beginner can have a successful aquarium with a minimum of maintenance. As the beginner becomes more comfortable in the hobby they will feel inclined to experiment a bit and thus build on the solid foundation they have already established.

It won`t always be necessary to dose your aquarium with each of the products in the Flourish line, but as an example, we have developed one possible dosing regimen using all of our plant products. This is by no means the only way to dose your aquarium; it is merely a suggestion. Your dosing regimen will depend greatly on a variety of factors, including lighting, initial water quality, how heavily stocked your aquarium is, substrate selection, and types of plants; so don`t be surprised if getting the results you want takes a little experimentation.

Concentration of nutrients in Flourite™:
  • Aluminum: 10210
  • Barium: 124
  • Calcium: 195
  • Cobalt: 6
  • Chromium: 13
  • Copper: 17
  • Iron: 18500
  • Potassium: 2195
  • Magnesium: 2281
  • Manganese: 64
  • Sodium: 223
  • Nickel: 12
  • Vanadium: 15
  • Zinc: 29
Units=mg/kg, source: Plasma Emission Spectrometer, EPA Method 3050, Univ. of Georgia Chemical Analysis Lab

Manufacturer information

Seachem Laboratories, Inc. was established in 1980 by Dr. Leo G. Morin. Seachem moved into a state of the art 110,000 square foot facility in Madison, Georgia marking their 25th anniversary in the industry in 2005. This facility includes production and research laboratories, manufacturing, inventory, shipping, and office space.

5 Stars


Reviewed on
July 29, 2020

Yes, I would recommend this.

good sand

Pros: easy to work with

Cons: had to wash multiple times very cloudy residue

i really like the sand it was easy to clean and also very natural and i really like how it sets on the aquarium the color also enhances the living room I really like it

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Reviewed on
April 03, 2020

Yes, I would recommend this.

Excellent substrate

Pros: Great color, best for newly planted plants, makes cleaning ea6

Cons: None that l have found

This is excellent substrate for a planted tank or not. The black makes everything stand out more. The sand is the best for holding onto small newly planted plants. It allows the new roots to spread easily. The sand doesn't allow much debris to get below the top surface which makes for easy removal when cleaning.

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Reviewed on
March 25, 2019

Yes, I would recommend this.

Great for delicate plants

Pros: Dense and small grain size is great for delicate plant roots to attach and grow. Black color looks fantastic with fish and plant contrast.

Cons: No macro content. Not as much volume per dollar as other options.

Great plant substrate for carpeting plants or plants with delicate roots! It is quite heavy so you don’t get quite as much volume per dollar as some other substrates, but still a fair amount. Good trace and mineral content, but no macro content in the substrate. I still like it and I didn’t have any issues with cloudy water after rinsing it thoroughly and make sure to pour water over a plate when adding it. The black color looks fantastic with colorful fish and contrasting plants!

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mandy roe

Reviewed on
August 07, 2012

Yes, I would recommend this.

Flourite Sand

Really great value!

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todd stacy

Reviewed on
October 17, 2011

Yes, I would recommend this.

Great product

i love it but if you have bristlenose plecostomus i wouldnt recomend it they will stir it up and it will uproot ur plants very easily. But other than that it is an excellent product and it came within like four days.

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Reviewed on
March 18, 2011

Yes, I would recommend this.

Looks nice. Makes water cloudy

We originally put down red eco complete for our plants. My wife told me she wanted yoyo loaches which need a soft substrate. I thought this product would be a better option. I read that this stuff will make your water cloudy so I rinsed it twice for 30 minutes a pop. When wet but out of the water has a very dense and compact feel to it. Once submerged it is like a very very fine silt. It tends to fall through cracks and move aroun retaining walls very easily so be careful while filling your tank. It was also so cloudy after filling the tank up 10% that we had little to no clue where we were planting things. I like to go to about 50% to plant anacharis so I can see how it will stand up but that was impossible due to the amount of murk this stuff creates. The next morning the water was somewhat clearer but not crystal (how I like my tank) so I begrudgingly bought some seachem water clarifier. More than 24 hours later it is clearer but not 100%. The product looks beautiful but is extremely difficult to work with compared to other planted substrates.

Was this review helpful? 6 0

bridge mei

Reviewed on
May 03, 2009

Yes, I would recommend this.

Great Color

The black sand has a great color and appearance once in the tank. And the fish seem to love it. (I'll have to wait and see how the plants do with the substrate) Only -1 star for the amount of dust! (took a good 3 washes and a 24 hours to really clear all of it up) Otherwise, extremely happy with it

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Reviewed on
November 04, 2008

Yes, I would recommend this.

a little dusty

I just set up my 125 gal tank with this stuff. Even after washing it my water was very cloudy, but after about a day the water cleared right up and it looks great. I havent put any plants in yet so i cant comment on that aspect but It looks really good.

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Reviewed on
August 12, 2008

Yes, I would recommend this.


A great product. Really is a beautiful color. Perfect for a planted (as in real) aquarium. Although the bag indicated no washing needed, i do disagree. No extensive washing is needed however. When washed the aquarium will clear in 48-72 hours.

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Reviewed on
June 21, 2008

Yes, I would recommend this.

The Happy Plant Substrate

I've been using flourite in one for or another for over a year, started with the hideous brown stuff and was impressed with the plant growth, and now seachem has released this great product. As everyone says its very dusty but I believe you're better off not washing it and having the patience to deal with the fine particulates as I think plants have an easier time absorbing nutrients from these. The results in my newest tank (with the black sand) are incredible. I have vallisineria under 2wpg lighting that have within a week sent off a runner with 4 new plants, and grown roughly 6"+. Great product.

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