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

One the the an initial things friend will have to take into consideration when setting up a brand-new fish tank is how much gravel you will have to add. The lot of gravel friend will require depends ~ above the watch you space trying come achieve, and also the type of fish and also plants you plan on including to your tank. If you desire to know just how much gravel friend will require for her tank, use the fish tank gravel calculator located above to discover the answer.

For many purposes, a gravel depth the 2 customs is sufficient for most fish tank setups. If you don’t setup on placing live plants in her tank girlfriend can get away with 1 inch of gravel or also less in part situations.


Planted Tanks


Planted tanks call for a minimum of 2 inches of gravel in order for the tree to construct a healthy root system. Larger plants with an ext extensive root solution will require much more substrate than smaller much less deeply rooted species.

The kind of gravel you pick for a planted tank is additionally another allude to consider. Smaller gravel like pea gravel is more suitable for a planted tank due to the fact that it gives the plants roots an ext area come colonize. Bigger gravel, ~ above the various other hand, won’t provide the plants enough surface area for its root to organize onto, which deserve to lead to poor nutrient absorption and sick poorly rooted plants.

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If you arrangement on including deep-rooted plants choose sword plants then it is advisable to have a tank through a gravel depth of at least 4 inches. Larger heavy feeding plants may likewise require an added nutrient basic under the gravel favor fluorite aquarium substrate to reach their full potential. Any added nutritive substrate should be taken into account when calculating the amount of gravel friend will must fill her tank.

Some plants favor anacharis have little to no source system because they pull your nutrients directly from the water, so they only really need the gravel to organize them in place. Because that plants v minimal root systems, every you will need to do is sink your crowns deep sufficient in the gravel so they don’t rise away.



Unplanted Tanks


The minimum recommended gravel depth because that an unplanted tank is 1 inch. The quantity and type of gravel you include to an unplanted tank really comes down to exactly how you desire the fish tank come look as soon as it is completely decorated. In part unplanted fish tanks, gravel can not also be necessary or desired like in a breeder tank, or in a tank whereby you want to store the debris and gathered waste come a minimum.

The just time an unplanted tank will require to have actually a depths gravel bed is if you plan on using an undergravel filter. In the case, her tank will need to have actually a gravel depth the at least 2 inches for the under gravel filter to occupational properly. The reason for this is the the gravel acts together the filter media as soon as you use an undergravel filter in your tank. In stimulate to eliminate ammonia, nitrites, and debris from the tank you need to have more gravel to rise the lot of surface ar area because that the bacteria to colonize and for the debris to gain trapped in.


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If you don’t setup on using an undergravel filter climate the depth that the gravel in your fish tank is just dependent ~ above your an individual preference. Some civilization like the watch of an aquarium through a deep substrate also in one unplanted tank. If others favor to include just sufficient gravel to cover the bottom of the tank so it is simply deep enough that over there is no glass or acrylic showing.

Most decorations will work well ~ above a shallow substrate due to the fact that they usually have actually smooth level bases that won’t damages a tank. Huge rocks, top top the various other hand, have the right to have sharp edges that deserve to crack or scrape a tank. If you plan on adding big 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 much Substrate for a 20 Gallon Tank



How much Gravel because that a 10 Gallon Tank

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

Choosing the right amount that gravel because that a 10 gallon tank is relatively easy as soon as you understand the tanks dimensions. Many ten gallon rectangular tanks room 20 inch long and also 10 customs wide. Which way the surface area the the bottom the a ten-gallon tank is 200 square inches.

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

A ten-gallon tank is a reasonably small tank, therefore, you could want to stick v one inch of gravel. This will enable your fish come have an ext room come swim roughly in, and it will increase the volume of water you can include to the tank. If ~ above the other hand, you arrangement on adding live plants v a deep source system, then you need to go through 2 customs of gravel also if the takes away a tiny tank space.



How much Gravel because that a 75 Gallon Aquarium

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

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

To sheathe 864 square inches v one inch of gravel you will require at the very least 56 pounds of gravel to execute the job. If you desire to have actually a 2-inch layer of gravel friend will need a minimum the 112 pounds of gravel to gain a layer the thick.

In most cases, a 2-inch class of gravel will certainly look fairly thin in a 75-gallon tank. Most civilization with large tanks choose to have a substrate layer that is 3-4 customs deep come fill out the tank. Which way you may need upwards that 224 pounds the gravel to get the look friend desire in a 75 gallon aquarium.



How much Substrate because that a 20 Gallon Tank


One the the most common aquariums in the fish maintaining hobby is the 20 gallon tank. Due to the fact that 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 we will resolve them independently so girlfriend can acquire a far better idea of exactly how much substrate they each need.


20 Gallon long Tank


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

The 20 gallon long aquarium take away up much more floor room which means it will require much more gravel 보다 a 20 gallon high tank. A 20 gallon lengthy tank procedures in in ~ 30 inch long and also 12 inch wide. Because of this a 20 gallon long tank has a surface area that 360 square inches on the bottom that the tank.

If you desire to cover 360 square inches with one customs of substrate friend will need 23 pounds of gravel. To add a 2 customs layer of substrate girlfriend will require 47 pounds that gravel to accomplish 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 overall footprint, and for that factor it is the much more economical tank to buy gravel for. The most typical size of a 20 gallon high tank is 24 customs long and 12 customs wide. That means the surface ar area at the bottom of the tank is 288 square inches, which is 72 square inches much less than a 20 gallon long tank.

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



How much 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 ~ above the market due to the fact that it provides a big volume without taking up a lot of floor space. A 55 gallon tank usually measures in at 48 customs long and 12 customs wide. Thus the bottom the a 55 gallon tank has actually a surface area of 576 square inches.

If you desire to sheathe 576 square inches with 1 inch of gravel friend will require 37 pounds that gravel. Come cover that same area with 2 customs of gravel you will require 74 pounds of gravel in bespeak to completely cover that same amount that space.

Like most other huge aquariums a 55 gallon tank might require a deeper gravel bed to have actually a filled out look. Also if you plan on adding large live plants to a 55 gallon aquarium climate you could want to add 3-4 inch of gravel come ensure your plants thrive in your tank. If you setup on including a 4 customs bed the gravel just be mindful it will certainly take 150 pounds the gravel to attain that gravel depth.



How much Gravel because that a 5 Gallon Tank

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

A 5 gallon tank is a little tank that won’t require much gravel once it comes time to obtain it up and running. Many 5 gallon tanks top top the industry measure in at 16 inches long and 8 inches wide. Which way they have a fairly small footprint of 128 square inches.

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