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

One the the first things you will have actually to consider when setting up a brand-new fish tank is how much gravel girlfriend will have to add. The amount of gravel friend will need depends top top the watch you room trying come achieve, and the type of fish and also plants you arrangement on adding to your tank. If you want to know just how much gravel girlfriend will need for her tank, use the fish tank gravel calculator located above to find the answer.

For most purposes, a gravel depth that 2 inches is sufficient for many fish tank setups. If you don’t setup on placing live plants in your tank girlfriend can obtain away through 1 customs of gravel or also less in part situations.


Planted Tanks


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

The form of gravel you pick for a planted tank is also another allude to consider. Smaller gravel choose pea gravel is much more suitable because that a planted tank because it gives the plants roots an ext area come colonize. Bigger gravel, ~ above the various other hand, won’t give the plants enough surface area because that its root to hold onto, which can lead to negative nutrient absorption and also sick poorly rooted plants.

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If you plan on including deep-rooted plants choose sword plants then it is advisable to have a tank with a gravel depth the at the very least 4 inches. Larger hefty feeding plants may likewise require an included nutrient basic under the gravel prefer fluorite aquarium substrate to with their full potential. Any additional nutritive substrate must be taken into account once calculating the amount of gravel you will should fill her tank.

Some plants prefer anacharis have little to no source system because they pull your nutrients right from the water, for this reason they just really need the gravel to organize them in place. Because that plants with minimal source systems, all you will must do is sink your crowns deep sufficient in the gravel for this reason they don’t to rise away.



Unplanted Tanks


The minimum encourage gravel depth because that an unplanted tank is 1 inch. The lot and form of gravel you add to an unplanted tank yes, really comes under to how you want the fish tank come look as soon as it is totally decorated. In some unplanted fish tanks, gravel could not also be essential or preferred like in a breeder tank, or in a tank wherein you want to store the debris and collected waste come a minimum.

The just time one unplanted tank will require to have a depth gravel bed is if you plan on using an undergravel filter. In the case, her tank will need to have actually a gravel depth of at least 2 inches for the under gravel filter to work-related properly. The factor for this is that the gravel acts together the filter media once you usage an undergravel filter in her tank. In bespeak to remove ammonia, nitrites, and debris native the tank you have to have much more gravel to boost the quantity of surface ar area because that the bacteria come colonize and for the debris to obtain trapped in.


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If girlfriend don’t arrangement on making use of an undergravel filter climate the depth that the gravel in your fish tank is only dependent on your an individual preference. Some human being like the look at of an aquarium v a deep substrate also in one unplanted tank. If others choose to include just enough gravel come cover the bottom the the tank so that is simply deep sufficient that over there is no glass or acrylic showing.

Most decorations will job-related well on a shallow substrate because they usually have smooth flat bases the won’t damages a tank. Big rocks, ~ above the various other hand, can have spicy edges that deserve to crack or scrape a tank. If you setup on adding huge rocks to your tank then having actually a deeper aquarium substrate can aid protect the bottom of her tank native inadvertent scratches or cracks.

Table of Contents

Aquarium Gravel DepthHow lot Substrate for a 20 Gallon Tank



How much Gravel for a 10 Gallon Tank

Aqueon 10 festival LED Aquarium Kit (Click come buy in ~
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 recognize the tanks dimensions. Most ten gallon rectangle-shaped tanks are 20 inch long and also 10 inch wide. Which way the surface area that the bottom the a ten-gallon tank is 200 square inches.

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

A ten-gallon tank is a reasonably small tank, therefore, you can want to stick v one customs of gravel. This will allow your fish come have more room to swim roughly in, and also it will rise the volume of water you can include to the tank. If on the other hand, you setup on adding live plants with a deep source system, climate you must go with 2 customs of gravel even 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 most ground come cover in a 75-gallon aquarium as soon as it come time to add the gravel. Most 75 gallon aquariums space 48 inches long and 18 inches wide. V a total surface area ~ above the bottom that the tank of 864 square inches.

To covering 864 square inches with one inch of gravel girlfriend will need at the very least 56 pounds the gravel to do the job. If you want to have a 2-inch great of gravel you will need a minimum the 112 pounds the gravel to obtain a layer the thick.

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



How much Substrate for a 20 Gallon Tank


One of the most typical aquariums in the fish maintaining hobby is the 20 gallon tank. Since it is together a popular tank volume it come in both long and also high configurations. The long and high 20 gallon tanks have different dimensions, so us will deal with them independently so you can acquire a better idea of 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 room which way it will require much more gravel than a 20 gallon high tank. A 20 gallon lengthy tank procedures in in ~ 30 customs long and also 12 customs wide. Thus a 20 gallon long tank has actually a surface area that 360 square customs on the bottom that the tank.

If you desire to covering 360 square inches with one customs of substrate you will need 23 pounds the gravel. To add a 2 inch layer the substrate friend will need 47 pounds that gravel to attain that depth.


20 Gallon High Tank

Aqueon LED Aquarium Kit (Click come 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 in its entirety footprint, and for that reason it is the an ext economical tank come buy gravel for. The most typical size the a 20 gallon high tank is 24 inch long and 12 customs wide. That means the surface ar area in ~ the bottom that the tank is 288 square inches, i beg your pardon is 72 square inches much less than a 20 gallon long tank.

To covering 288 square inches through one customs of gravel you will need 19 pounds of gravel. In stimulate to have a 2 inch substrate layer, you will require 37 pounds the gravel. As you can see you can obtain away with a lot less gravel in a 20 gallon high tank versus a 20 gallon lengthy tank for any type of given depth that gravel you might require.



How lot Gravel because that 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 an ext popular entry-level large aquariums ~ above the market due to the fact that it offers a huge volume without taking up a most floor space. A 55 gallon tank usually steps in in ~ 48 inches long and 12 inches wide. Thus the bottom the a 55 gallon tank has a surface area that 576 square inches.

If you want to sheathe 576 square inches through 1 customs of gravel girlfriend will need 37 pounds that gravel. Come cover that same area v 2 inches of gravel friend will need 74 pounds of gravel in stimulate to completely cover that very same amount the space.

Like many other big aquariums a 55 gallon tank may 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 can want to add 3-4 inches of gravel to ensure her plants flourish in your tank. If you arrangement on adding a 4 inch bed that gravel simply be aware it will take 150 pounds of gravel to achieve 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 l x 8 in W8 lbs17 lbs

A 5 gallon tank is a small tank that won’t require lot gravel once it come time to acquire it up and running. Many 5 gallon tanks ~ above the sector measure in at 16 inches long and 8 inches wide. Which method they have a reasonably small footprint of 128 square inches.

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