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

One the the first things girlfriend will have actually to think about when setup up a new fish tank is just how much gravel friend will need to add. The lot of gravel girlfriend will need depends top top the look at you space trying come achieve, and the type of fish and plants you arrangement on including to her tank. If you desire to know how much gravel friend will require for her tank, use the fish tank gravel calculator located over to uncover the answer.

For most purposes, a gravel depth that 2 inch is sufficient for many fish tank setups. If friend don’t plan on putting live plants in your tank you can get away through 1 inch of gravel or even less in part situations.


Planted Tanks


Planted tanks require a minimum that 2 customs of gravel in order because that the plants to construct a healthy and balanced root system. Larger plants with much more extensive root solution will require an ext substrate than smaller less deeply rooted species.

The type of gravel you pick for a planted tank is also another suggest to consider. Smaller sized gravel prefer pea gravel is much more suitable for a planted tank due to the fact that it offers the tree roots more area come colonize. Bigger gravel, ~ above the other hand, won’t offer the plants enough surface area for its root to hold onto, which have the right to lead to negative nutrient absorption and sick poorly rooted plants.

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If you arrangement on adding deep-rooted plants choose sword plants climate it is recipient to have actually a tank v a gravel depth of at the very least 4 inches. Larger heavy feeding plants may likewise require an added nutrient base under the gravel like fluorite aquarium substrate to reach their complete potential. Any additional nutritive substrate should be taken right into account once calculating the lot of gravel girlfriend will have to fill her tank.

Some plants choose anacharis have little to no source system because they pull your nutrients straight from the water, so they just really need the gravel to hold them in place. Because that plants v minimal source systems, every you will have to do is sink their crowns deep enough in the gravel therefore they don’t float away.



Unplanted Tanks


The minimum encourage gravel depth for an unplanted tank is 1 inch. The lot and kind of gravel you include to one unplanted tank really comes under to exactly how you desire the fish tank come look once it is fully decorated. In some unplanted fish tanks, gravel might not also be important or desired like in a breeder tank, or in a tank whereby you desire to save the debris and collected waste to a minimum.

The only time one unplanted tank will require to have actually a depth gravel bed is if you setup on utilizing an undergravel filter. In the case, your tank will need to have a gravel depth of at least 2 inches because that the under gravel filter to work-related properly. The reason for this is the the gravel acts as the filter media as soon as you use an undergravel filter in her tank. In stimulate to remove ammonia, nitrites, and debris indigenous the tank you must have an ext gravel to rise the lot of surface area because that the bacteria come colonize and for the debris to gain trapped in.


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If girlfriend don’t setup on utilizing an undergravel filter climate the depth of the gravel in your fish tank is just dependent ~ above your an individual preference. Some people like the watch of one aquarium through a deep substrate even in an unplanted tank. When others prefer to include just enough gravel come cover the bottom the the tank so the is just deep enough that over there is no glass or acrylic showing.

Most decorations will work-related well on a shallow substrate due to the fact that they usually have actually smooth flat bases the won’t damages a tank. Big rocks, on the various other hand, have the right to have spicy edges that have the right to crack or scratch a tank. If you setup on adding big rocks to her tank then having actually a depths aquarium substrate can aid protect the bottom of your tank native inadvertent scratches or cracks.

Table of Contents

Aquarium Gravel DepthHow much Substrate because that a 20 Gallon Tank



How much Gravel because that a 10 Gallon Tank

Aqueon 10 gal LED Aquarium Kit (Click come buy in ~
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 relatively easy when you recognize the tanks dimensions. Many ten gallon rectangular tanks are 20 inch long and 10 inches wide. Which method the surface area the the bottom that a ten-gallon tank is 200 square inches.

In order to cover 200 square inches v one inch of gravel, you will require a minimum that 13 pounds that gravel. If you prefer to have actually a two-inch gravel class in a 10-gallon tank then you will require 26 lbs the gravel.

A ten-gallon tank is a relatively small tank, therefore, you could want to stick with one customs of gravel. This will allow your fish to have much more room come swim roughly in, and also it will boost the volume the water you can include to the tank. If on the various other hand, you setup on adding live plants v a deep source system, then you need to go v 2 customs of gravel even if it takes far a small 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 most ground come cover in a 75-gallon aquarium as soon as it comes time to include the gravel. Most 75 gallon aquariums room 48 inch long and 18 inch wide. V a full surface area ~ above the bottom the the tank the 864 square inches.

To covering 864 square inches v one customs of gravel friend will require at the very least 56 pounds that gravel to execute the job. If you desire to have a 2-inch class of gravel girlfriend will require a minimum the 112 pounds of gravel to acquire a layer the thick.

In most cases, a 2-inch great of gravel will look rather thin in a 75-gallon tank. Most human being with huge tanks like to have actually a substrate layer the is 3-4 customs deep come fill out the tank. Which method you might need upwards that 224 pounds of gravel to get the look you desire in a 75 gallon aquarium.



How lot Substrate for a 20 Gallon Tank


One of the most typical aquariums in the fish keeping hobby is the 20 gallon tank. Since it is such a famous 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 address them separately so friend can get a far better idea of just how much substrate they each 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 take away up much more floor an are which means it will certainly require more gravel 보다 a 20 gallon high tank. A 20 gallon lengthy tank actions in in ~ 30 inches long and 12 inches wide. Because of this a 20 gallon long tank has actually a surface ar area of 360 square customs on the bottom the the tank.

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


20 Gallon High Tank

Aqueon LED Aquarium Kit (Click to Buy at
DimensionsGravel: 1 in.Gravel: 2 in.
24 in l x 12 in W19 lbs37 lbs

The 20 gallon high aquarium has actually a smaller as whole footprint, and also for that factor it is the much more economical tank to buy gravel for. The most typical size that a 20 gallon high tank is 24 inches long and also 12 inches wide. That way the surface ar area in ~ the bottom of the tank is 288 square inches, i m sorry is 72 square inches less than a 20 gallon lengthy tank.

To cover 288 square inches with one customs of gravel girlfriend will need 19 pounds of gravel. In bespeak to have a 2 customs substrate layer, girlfriend will require 37 pounds of gravel. Together you deserve to see you can get 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 that gravel you might require.



How lot Gravel for a 55 Gallon Tank

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

A 55 gallon tank is among the much more popular entry-level large aquariums on the market due to the fact that it gives a large volume without taking up a many floor space. A 55 gallon tank usually steps in at 48 inch long and also 12 customs wide. Therefore the bottom the a 55 gallon tank has actually a surface area that 576 square inches.

If you want to covering 576 square inches v 1 inch of gravel girlfriend will require 37 pounds that gravel. Come cover that exact same area through 2 inch of gravel you will need 74 pounds that gravel in order to totally cover that same amount of space.

Like most other large aquariums a 55 gallon tank might require a depth gravel bed to have actually a filled the end look. Likewise if you arrangement on adding big live plants to a 55 gallon aquarium then you can want to include 3-4 customs of gravel come ensure her plants thrive in your tank. If you arrangement on including a 4 inch bed the gravel just be mindful it will take 150 pounds of gravel to accomplish that gravel depth.



How much Gravel because that a 5 Gallon Tank

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

A 5 gallon tank is a tiny tank that won’t require much gravel when it come time to obtain it up and also running. Many 5 gallon tanks ~ above the market measure in in ~ 16 inch long and also 8 inches wide. Which means they have actually a reasonably small footprint the 128 square inches.

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In order come cover 128 square inches v 1 inch of gravel, you will certainly only require 8 pounds of gravel. If you choose to have actually a gravel depth that 2 inches then you will require 17 pounds the gravel.