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Seachem Laboratories Flourite Black Substrate - 7Kilograms / 15.4 lbs


Item #: SC5235

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
April 04, 2019

Yes, I would recommend this.

Flourite Black

Cons: Takes a bit of rinsing

Not really sure why people say what they say about this substrate, but after some rinsing it’s fine. Yes it was a little more rinsing than any other I used, but I’ve had no trouble so far. The color is black, not grayish like some people say. I would buy this again.

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sam cohen

Reviewed on
September 26, 2012

Yes, I would recommend this.

Pretty good!

I took other people's advice and put it all in a old pillow case (use an old one as you wont want to keep it after) and stuck my shower head in to wash the dust out. It probably ran about an hour before the water ran clear. With this technique there was minimal dust in my tank and the water was crystal clear after filling it (make sure you pour the water on a plate). It looks amazing in my tank. My cherry shrimp really stand out against the black and my plants seem to love it!

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Reviewed on
April 25, 2012

No, I would not recommend this.

grey orange and white staff

one of bags I've got had bunch of other small stones in different colors, too bad I realized that when dumped everything together, now, to get nice clean BLACK I have to pick that garbage piece by piece which is pretty annoying - it really looks like construction trash other than that it is great... so careful and check every bag before putting in to mix

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martin versluis

Reviewed on
May 28, 2010

Yes, I would recommend this.

Great Stuff

I use this for all my planted aquariums with great success. I particularly like the black because it makes the plants really stand out. This is an easy recommendation. Also, the service and prices at petstore.com was top notch.

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Reviewed on
September 22, 2007

Yes, I would recommend this.

Black Flourite

Very good substrate. Color is black to grayish black. 3mm size and will not affect pH. Be sure to wash before using. I needed six bags to fill my 55 gal about 3 inches.

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