A Simple Guide to Setting Up Your Aquarium


Last Updated: May 28, 2021

If you’re planning on getting fish for a home aquarium, congratulations! Fishkeeping is a fun hobby that can be very rewarding. But that’s not to say it’s without its own challenges. It’s extremely common for people to get everything needed for an aquarium, including the fish, all in one trip to the store. There are a lot of issues that can stem from this, but they all come back to poor planning. Bringing home new living things requires time and planning, whether it’s a dog or a fish. Besides, you’ll save yourself a lot of time and money by identifying everything you need to get started before you even purchase an aquarium. Here are the things you need to know about setting up an aquarium.

First Things First: Pick Your Fish

To be clear, you should pick out what kind of fish you want for your aquarium. Don’t go to the store and buy fish just yet! You do need to know what type of fish you’re intending to get before you start buying anything, though. Do as much research as you possibly can, starting with the fish you’re most interested in. You may start reading about a fish, only to realize it’s not for you. Some fish aren’t for beginners, some have specific tank size needs, some don’t get along with tank mates. All fish aren’t for all fish keepers, especially if you’re a new fish keeper.

Where to Start?

goldfish tank_Piqsels
Image Credit: Piqsels

Fish like guppies and goldfish tend to be popular fish that are great for new fish keepers because they are hardy, interesting, and generally can withstand a learning curve. However, if you read up on guppies and goldfish, you’ll realize that they’re not ideal tank mates. They have different temperature preferences and goldfish will eat just about anything, including guppy fry. In fact, if your goldfish are big enough, they’ll eat your adult guppies too!

If you have no idea where to start, a good starting point is to check out forums or even go to your local aquatic stores, look at the fish, and talk to the employees. This is really going to help you narrow down your fish preferences and help you identify fish that make good tank mates.

Now You Need an Aquarium

Aquarium_rodimov_Shutterstock
Image Credit: rodimov, Shutterstock

Once you’ve identified the type of fish you’re interested in and you’ve become acquainted with their needs, you should have a good idea of the size of tank they need. Some fish even have preferences for the shape of their tank. Weather loaches are going to have vastly different tank needs than a shoal of neon tetras. Keep in mind that you don’t have to buy a tank right away that will suit the maximum size of your fish, but you should have a plan in mind to address a new tank when the time comes. That cute 3-inch weather loach may be a 10-inch behemoth before you know it, and that’s not even counting its friends since weather loaches prefer to be kept in groups. Don’t set yourself up to fail with your tank!

Here are the tank elements you need to investigate for your chosen fish:

  • Filtration: There are hundreds of filters on the market, so narrowing it down to the perfect one can be intimidating. The size, type, and number of fish you’re planning to bring home will help you choose. A tank with Neocaridina shrimp can get by with just a sponge filter. A tank with four goldfish likely needs a HOB or canister filter that is rated for a tank larger than the tank you’ve purchased. Generally, you can under filtrate, but you aren’t going to over filtrate your tank. The exception to this is that some fish require very slow-moving or gentle currents. Betta fish, for example, cannot withstand strong filters with powerful output and usually do best with low-powered filtration. You should, however, still plan to provide adequate filtration.
  • Heating: Guess what! Not all fish need heaters! Cool and cold-water fish usually don’t require heaters when kept in climate-controlled environments, like inside a house with heating and air conditioning. Unless you keep your house unusually cool, you may not need a heater for goldfish. Most tetras, on the other hand, are tropical fish, so they require a heater, even in comfortable indoor environments. Investing in an aquarium thermometer will help you monitor the temperature while you’re preparing your tank for fish, so this gives you plenty of time to see how different temperatures in the room the aquarium will be kept in may impact the temperature of the water, allowing you to make an educated decision about a heater.
  • Substrate: Any fish that forage or spend time in the lower parts of the water column will have preferences for substrate textures and densities. Kuhli loaches like to burrow, so they do well with sand and other soft substrates. Goldfish have been known to get gravel lodged in their mouth, so they tend to do best with sand or pebbles that are too large for them to fit into their mouth. Also, some substrates will alter your water chemistry. Crushed coral, aragonite, and some planted tank substrates will raise or lower your tank pH. Aquarium gravel and sand are usually inert and won’t alter the pH, but there are exceptions to this. Make sure you thoroughly investigate the potential impacts your substrate may have on your water parameters.
  • Tank Stand: Technically, this isn’t part of your tank, but it’s extremely important you choose the right tank stand. A gallon of water weighs around 8-9 pounds, so a 10-gallon tank is going to weigh significantly less than a 75-gallon tank. When it comes to determining the weight of your tank, also remember to count the weight of the empty tank and any substrate or décor you’re planning to add. You can’t just grab that old dresser from your garage and call it a tank stand. Not all pieces of furniture are strong enough to hold an aquarium. The last thing you want is to come home to a flooded house and dead fish because the stand you chose collapsed.

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Fancy Up the Place!

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Image Credit: Krysja, Shutterstock

Live plants are an excellent addition to an aquarium. They help to remove waste products from the water and can provide an enriching environment for your fish. However, some fish are extremely hard on live plants! You may be able to figure out how to outsmart goldfish or cichlids to prevent them from uprooting and killing every plant you place in the tank, but some fish are dead set on destroying any semblance of plant life you put in the tank.

Knowing what you’re dealing with before you buy any plants will help you decide which plants to choose. Some are hardy enough to stand up to the abuse from your fish, while other plants regenerate fast enough that your fish won’t be able to destroy all of it before it grows back.

Décor can be a fun addition to an aquarium, but it can also serve an important purpose for some animals. Some fish like to have caves or rocky outcrops to spend time in. Nocturnal fish often prefer a dark, quiet place to spend time in during the day. Long-finned fish, like fancy goldfish and bettas, usually need to have décor that doesn’t have rough or sharp edges that may snag and tear their fins. Some fish like to squeeze inside of décor, but then can’t get back out without you having to crack the décor in half with surgical precision. All of these things should be considered when you’re picking tank décor.

Cycle Your Tank

fish tank_Ja Crispy_Shutterstock
Image Credit: Ja Crispy, Shutterstock

Even though people have been buying fish and tossing them straight into a new tank or bowl for centuries, we now know that’s not the best practice. Tank cycling is the process of establishing colonies of beneficial bacteria in your aquarium. Beneficial bacteria consume waste products, namely, nitrite and ammonia, converting them to nitrate, which can then be absorbed by live plants or removed with water changes.

Ammonia and nitrite both have the potential to poison your fish, leading to permanent injury and even death. Establishing a tank environment that supports your beneficial bacteria means your tank will be able to naturally maintain safe levels of waste products.

How to Cycle a Tank

aquarium cycle_hedgehog94_Shutterstock
Image Credit: hedgehog94, Shutterstock

There are a few ways to cycle a tank, but the two most common are to either add straight ammonia in small quantities to the tank or to drop food in the tank and allow it to rot, creating ammonia as it decays. This provides food for the beneficial bacteria, allowing the colonies to grow and thrive. You will need to invest in a test kit that checks ammonia, nitrite, and nitrate levels, and check these levels regularly while your tank is cycling. Once your tank has no ammonia or nitrite, but does have low levels of nitrate present, it’s cycled.

Of course, you’ve likely spotted the bottled bacteria or “quick start-up” products that are sold with the claim that you can immediately add fish to the tank. Some of these products are useful, but they don’t replace properly cycling your tank. If you know someone with an established tank, they may be willing to give you some used filter media to help you jumpstart your tank’s cycle. Sometimes, your local fish store will be willing to give you used filter media.

Choose the Right Filter Media

aquarium filter_Andrey_Nikitin_Shutterstock
Image Credit: Andrey_Nikitin, Shutterstock

A major component of cycling a tank and maintaining that cycle is choosing filter media that provides a high surface area for the beneficial bacteria to colonize. While many filter manufacturers advise you to change cartridges out monthly or even weekly, you are removing a chunk of your good bacteria every time you replace the cartridges. Choosing long-lasting filter media that requires little to no replacement will help you maintain these colonies.

Stock Up

While you’re waiting on your tank to cycle, which can take a matter of weeks or even months, it’s a good plan to go ahead and start stocking up on aquarium supplies. Not just things like fishnets and food, but also broad-spectrum medications and water conditioners. Having these things on hand can save you time when it matters, like if you have a sick fish. It can also save you money, especially if you watch for sales and deals instead of waiting until you need the product quickly.

Ok, Now You’re Ready!

Image Credit: luckypic, Shutterstock

Once your tank is fully cycled and you’ve gotten stocked up on everything you need to bring your fish home, it’s time to bring the fish home! You can get fish from local aquatics stores, pet stores, or online vendors. Be prepared to prophylactically treat or quarantine your new fish in case they are coming to you after an exposure to an illness or parasite. And as hard as it is, be patient! It can be disappointing to go to the store only to see they’re still sold out of the fish you want for the fourth week in a row. However, if you’ve already put all this time and planning into your tank, the last thing you want is to have to do is start over with getting your tank set up correctly for different fish.

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Conclusion

Setting up an aquarium and bringing your new fish home is an exciting time. Nobody will blame you for being a little bit giddy! It sounds like a lot of planning, and honestly, it is. All the effort and planning that goes into setting up an aquarium for your fish will pay off, though. Providing the best environment possible for your new aquatic friends will be rewarding and learning about each fish’s unique personality and preferences will make all the time you spent setting things up worth it.

SEE ALSO: 31 Types of Discus Fish (Which to Choose)


Featured Image Credit: Piqsels



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