How Many Guppies in 10 Gallon Fish Tank?

Learning how to properly set-up and care for a fish tank can be an overwhelming topic for beginners who are new to the concept. If you are looking to set up your very first fish tank full of guppies, then you have come to the right place.

In this article, you will find a thorough overview of the proper information for how to stock and care for guppies in a ten-gallon fish tank. While the basic recommendation for the number of guppies kept in a ten gallon fish tank is 5-10, there are actually quite a few factors that can change the number in different tanks.

Guppies tank

How to Calculate the Number of Guppies for a Fish Tank?

The easiest method for calculating the proper number of guppies for different sized fish tanks requires a use of a simple equation. For every gallon of water inside the aquarium, you can add around one inch of fish.

It is important to remember, though, that if you have a 10-gallon aquarium, that does not mean your aquarium holds 10 gallons of water. Some of the space in your aquarium is taken up by gravel, your filter, the heater, and any plants you choose to put in the bottom.

In general, a ten-gallon tank will only hold between seven and eight gallons of water once you consider all of the other factors that are taking up space.

One fully grown; a guppy fish could grow to upwards of 1.5 inches in length. This length does not include the tail fins on the guppy, of course.

Once you calculate the equation this means that you could theoretically hold 6-7 guppies inside of a ten-gallon tank.

However, beginners may want to consider having fewer guppies within their tank while they learn the ins and outs of taking care of fish.

Taking care of fish is actually a complicated process. By starting out with fewer fish in your aquarium, you will give yourself more time to learn the process instead of overwhelming your tank or your fish too quickly.

Female-Guppy

Add More Guppies Into 10 Gallon Aquarium?

If you have been thinking about starting a fish tank for some time, then you have probably seen pictures online of those beautiful fish tanks that are overpopulated considering the formula we have already discussed in this article. You may be wondering how those fish are able to remain healthy in an overcrowded environment.

There are actually a few different methods you can use to overcome overcrowding concerns within your fish tank. Each of the following will be discussed in more detail below:

  • Invest in a powerful (internal or external) filter
  • Use Bio Filter Media in addition
  • Invest in some living plants for your tank
  • Consider changing gravel to a special substrate
  • Feed fish less often
  • Change Tank Water More Frequently

While all of these options are viable for protecting your fish in a more crowded tank, each one has its own pros and cons. Check out the more detailed information below.

Invest in a Powerful (Internal or External Filter)

Most beginners purchase an aquarium kit when they begin the adventure of building their aquarium. The filters that come inside of these kits are perfectly adequate for the size aquarium you are buying, but they are not powerful enough to deal with an aquarium that is overstocked for its size.

So, if you are looking to add more fish to your aquarium, you may consider purchasing a more powerful internal filter for the tank.

You may also consider adding an external filter, like one that hangs over the back of your aquarium. This filter has an added bonus of taking up none of the space within your aquarium. Which means that you have more capacity for water.

To ensure that the filter you have purchased is adequate for increased fish capacity, buy a filter built for a bigger tank than the one you own.

Use Good Filter Media

Filter media is a part of the overall filter that catches the bad junk filtering out of the water.

Standard filters will come with a sponge, but there are a lot of other options that are far more productive when it comes to filter media.

No matter what material you choose, be sure it is large enough to service the overstocked tank.

Invest in Live Plants

Not only are live plants gorgeous in the bottom of your tank, but they are actually much more healthy for your fish than the fake plastic plants you can buy.

Live plants actually help to filter the water in the tank by absorbing the waste emitted by your fish. In turn, the plants use that waste as fertilizer and will grow by absorbing that fertilizer.

Get Rid of Gravel

Most beginner aquarium hobbyists will put gravel in the bottom of their tank. This is perfectly logical because it is easy to get. It is also easy to clean and it looks really good on the bottom of the tank.

The issue with gravel is that gravel is nothing but a space taker. Gravel does not help to keep the water clean, so it is not a great choice for a highly populated tank.

Do some research about the different substrates you might choose. We recommend a substrate that helps break down waste emitted by fish.

Feed Fish Less Often

Many beginner aquarium enthusiasts make the mistake of feeding their fish far too often. While your fish may eat often, they will not always be hungry and this can attribute to health issues and a dirty tank.

For guppies, you can actually reduce their feeding to every other day. This will keep them from getting sick and help to keep your tank pretty clean in the process.

Clean It More Often

Clean your tank weekly if you can. You can do this by replacing 30-50% of the water. This is only necessary if your tank is more populated than is recommended.

Final Thoughts

Taking care of guppies in a new fish tank is a fun and exciting adventure. We hope that you have learned a lot about the basics of guppy care in this guide.

Richard Rowlands
Richard Rowlands

Hello fellow aquatics enthusiasts! My name is Richard Rowlands. I’m an aquarium keeper and enthusiast and have been for about 25 years or so. While I won’t claim to be the end-all expert on aquatic life, I will say that I know my way around a tank.

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