Gravel type - (Pea Gravel)Gravel type - (Regular Gravel)Gravel kind - (Dolomite Gravel)

One of the very first things girlfriend will have actually to take into consideration when setup up a brand-new fish tank is exactly how much gravel friend will have to add. The lot of gravel friend will need depends on the watch you space trying come achieve, and the kinds of fish and also plants you setup on including to her tank. If you want to know how much gravel you will need for your tank, use the fish tank gravel calculator located above to find the answer.

For most purposes, a gravel depth of 2 inches is sufficient for many fish tank setups. If girlfriend don’t plan on putting live plants in your tank you can acquire away v 1 inch of gravel or also less in part situations.


Planted Tanks


Planted tanks need a minimum that 2 inches of gravel in order because that the tree to build a healthy root system. Bigger plants with more extensive root equipment will require much more substrate 보다 smaller much less deeply rooted species.

The form of gravel you choose for a planted tank is additionally another suggest to consider. Smaller gravel prefer pea gravel is an ext suitable for a planted tank since it provides the plants roots an ext area to colonize. Bigger gravel, top top the various other hand, won’t provide the plants sufficient surface area for its root to host onto, which can lead to poor nutrient absorption and sick poorly rooted plants.

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If you plan on including deep-rooted plants choose sword plants climate it is recipient to have actually a tank v a gravel depth of at least 4 inches. Larger heavy feeding tree may also require an added nutrient base under the gravel like fluorite aquarium substrate to with their full potential. Any added nutritive substrate should be taken right into account when calculating the amount of gravel girlfriend will have to fill her tank.

Some plants prefer anacharis have small to no source system since they pull your nutrients right from the water, for this reason they only really require the gravel to hold them in place. Because that plants with minimal source systems, every you will have to do is sink your crowns deep enough in the gravel for this reason they don’t float away.



Unplanted Tanks


The minimum encourage gravel depth because that an unplanted tank is 1 inch. The amount and form of gravel you add to one unplanted tank yes, really comes down to just how you want the fish tank come look as soon as it is fully decorated. In part unplanted fish tanks, gravel can not also be necessary or preferred like in a breeder tank, or in a tank whereby you want to store the debris and gathered waste to a minimum.

The just time an unplanted tank will need to have a deeper gravel bed is if you plan on utilizing an undergravel filter. In the case, her tank will require to have a gravel depth of at the very least 2 inches because that the under gravel filter to work properly. The reason for this is the the gravel acts together the filter media when you use an undergravel filter in your tank. In bespeak to remove ammonia, nitrites, and debris from the tank you need to have more gravel to boost the quantity of surface area because that the bacteria come colonize and for the debris to gain trapped in.


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If you don’t plan on utilizing an undergravel filter then the depth of the gravel in your fish tank is just dependent top top your an individual preference. Some human being like the look at of an aquarium through a deep substrate also in an unplanted tank. While others like to include just enough gravel come cover the bottom of the tank so it is simply deep sufficient that there is no glass or acrylic showing.

Most decorations will occupational well ~ above a shallow substrate because they usually have actually smooth level bases the won’t damages a tank. Large rocks, ~ above the other hand, have the right to have spicy edges that have the right to crack or scrape a tank. If you plan on adding huge rocks to your tank then having actually a depth aquarium substrate can aid protect the bottom of her tank native inadvertent scratches or cracks.

Table that Contents

Aquarium Gravel DepthHow lot Substrate for a 20 Gallon Tank



How much Gravel because that a 10 Gallon Tank

Aqueon 10 gal LED Aquarium Kit (Click to buy at
DimensionsGravel: 1 in.Gravel: 2 in.
20 in together x 10 in W13 lbs26 lbs

Choosing the ideal amount that gravel because that a 10 gallon tank is fairly easy as soon as you know the tanks dimensions. Most ten gallon rectangle-shaped tanks space 20 customs long and also 10 inches wide. Which means the surface ar area of the bottom that a ten-gallon tank is 200 square inches.

In order come cover 200 square inches v one customs of gravel, girlfriend will need a minimum the 13 pounds the gravel. If you choose to have actually a two-inch gravel class in a 10-gallon tank climate you will need 26 lbs that gravel.

A ten-gallon tank is a fairly small tank, therefore, you might want to stick with one customs of gravel. This will permit your fish come have more room come swim roughly in, and also it will rise the volume of water you can include to the tank. If ~ above the various other hand, you arrangement on including live plants with a deep source system, climate you have to go through 2 inches of gravel also if that takes far a little tank space.



How lot Gravel for a 75 Gallon Aquarium

photo by: Jessa CC BY-ND 2.0
DimensionsGravel: 1 in.Gravel: 2 in.
48 in together x 18 in W56 lbs112 lbs

There is a lot of ground to cover in a 75-gallon aquarium when it come time to include the gravel. Most 75 gallon aquariums space 48 inch long and also 18 inches wide. With a total surface area on the bottom that the tank that 864 square inches.

To cover 864 square inches with one inch of gravel you will need at least 56 pounds the gravel to perform the job. If you desire to have a 2-inch class of gravel you will need a minimum that 112 pounds of gravel to acquire a layer the thick.

In most cases, a 2-inch layer of gravel will look quite thin in a 75-gallon tank. Most human being with large tanks like to have a substrate layer that is 3-4 customs deep come fill the end the tank. Which means you might need upwards the 224 pounds the gravel to obtain the look friend desire in a 75 gallon aquarium.



How much Substrate for a 20 Gallon Tank


One of the most common aquariums in the fish maintaining hobby is the 20 gallon tank. Due to the fact that it is together a renowned tank volume it comes in both long and also high configurations. The long and also high 20 gallon tanks have various dimensions, so us will deal with them individually so you can gain a much better idea of exactly how much substrate they every need.


20 Gallon long Tank


DimensionsGravel: 1 in.Gravel: 2 in.
30 in l x 12 in W23 lbs47 lbs

The 20 gallon lengthy aquarium takes up an ext floor space which method it will require more gravel 보다 a 20 gallon high tank. A 20 gallon lengthy tank steps in at 30 customs long and 12 inches wide. Because of this a 20 gallon lengthy tank has a surface ar area that 360 square inches on the bottom that the tank.

If you desire to sheathe 360 square inches through one inch of substrate friend will require 23 pounds of gravel. To include a 2 customs layer of substrate you will require 47 pounds of gravel to achieve that depth.


20 Gallon High Tank

Aqueon LED Aquarium Kit (Click come Buy in ~
DimensionsGravel: 1 in.Gravel: 2 in.
24 in together x 12 in W19 lbs37 lbs

The 20 gallon high aquarium has a smaller all at once footprint, and for that factor it is the much more economical tank come buy gravel for. The most common size that a 20 gallon high tank is 24 inch long and 12 customs wide. That means the surface area in ~ the bottom that the tank is 288 square inches, i m sorry is 72 square inches less than a 20 gallon long tank.

To sheathe 288 square inches with one customs of gravel girlfriend will need 19 pounds the gravel. In bespeak to have actually a 2 customs substrate layer, friend will require 37 pounds that gravel. Together you can see girlfriend can acquire away with a lot much less gravel in a 20 gallon high tank matches a 20 gallon lengthy tank for any type of given depth the gravel you may require.



How much Gravel for a 55 Gallon Tank

Travis Lee CC through 2.0
DimensionsGravel: 1 in.Gravel: 2 in.
48 in together x 12 in W37 lbs74 lbs

A 55 gallon tank is among the more popular entry-level big aquariums top top the market since it gives a huge volume without acquisition up a the majority of floor space. A 55 gallon tank usually measures in at 48 inches long and 12 inches wide. As such the bottom the a 55 gallon tank has actually a surface ar area of 576 square inches.

If you want to cover 576 square inches v 1 inch of gravel girlfriend will require 37 pounds that gravel. To cover that exact same area through 2 inch of gravel girlfriend will require 74 pounds the gravel in stimulate to fully cover that very same amount the space.

Like most other large aquariums a 55 gallon tank may require a depths gravel bed to have actually a filled out look. Also if you arrangement on adding huge live plants to a 55 gallon aquarium then you could want to include 3-4 customs of gravel to ensure your plants thrive in your tank. If you arrangement on adding a 4 inch bed the gravel simply be mindful it will certainly take 150 pounds the gravel to accomplish that gravel depth.



How much Gravel for a 5 Gallon Tank

Aqueon 5 Gallon MiniBow LED Aquarium Kit (Click to Buy in ~
DimensionsGravel: 1 in.Gravel: 2 in.
16 in together x 8 in W8 lbs17 lbs

A 5 gallon tank is a tiny tank the won’t require much gravel as soon as it comes time to obtain it up and running. Most 5 gallon tanks top top the market measure in in ~ 16 customs long and also 8 inch wide. Which means they have a fairly small footprint that 128 square inches.

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In order to cover 128 square inches with 1 inch of gravel, you will only need 8 pounds that gravel. If you favor to have actually a gravel depth that 2 inches then you will require 17 pounds of gravel.