How to Introduce a Pleco to a Goldfish Tank

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Goldfish can be a beautiful species of fish to care for. Their bright color and peaceful personality can make a great addition to any fish tank. However, the tank itself may begin to accumulate algae and cleaning it can be a bother. To help cut down on cleaning, many people introduce a pleco fish to their goldfish tank. Plecos will naturally seek out and eat the algae and plant matter that can build up in a tank. Before you add a pleco to your tank, it can be useful to learn more about what they need to stay healthy and be a good tank-mate to your goldfish.

Part 1
Part 1 of 3:

Picking the Right Pleco

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  1. Although most pet stores will sell plecos that are only a few inches in length, you should know that they can grow quite large. Fully grown plecos can reach up to two feet in length. The exact size of the pleco will vary depending on the species. Ask someone at the pet store how large the pleco will get before making a purchase. [1] [2]
  2. There are a few varieties of pleco fish and each will have their own temperament. Some plecos may become rather aggressive when they grow to a larger size or encounter other fish. Because of this, you will want to make sure that the species you are buying will be safe to place in the same tank as your goldfish. Ask someone at your pet store if the pleco you are interested in would be a good mix with your goldfish. [3] [4] [5] [6]
    • Rubber-lipped plecos are generally non-aggressive towards goldfish and prefer a similar tank environment.
    • Longfin bristlenose plecos will usually have no conflicts with your goldfish. However, these plecos tend to fight with other plecos.
    • Zebra plecos tend to be more carnivorous and may eat other fish in your tank.
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  3. Plecos can live for a long time and grow quite large. Because they can live so long, you'll need to be committed to caring for the pleco over the course of its life. If you don't think you will maintain your goldfish tank for around ten years, you may want to reconsider purchasing a pleco. [7] [8]
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Part 2
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Getting the Tank Ready for Your Pleco

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  1. Plecos will start off quite small and can seem like the perfect addition to any goldfish tank. However, it's important to realize that your pleco can grow up to 2 feet in length. You'll need to have a tank large enough to accommodate the full grown pleco or have plans to provide a larger tank later on. [9] [10] [11]
    • The tank should be around 75 gallons to comfortably accommodate a fully grown pleco.
    • Plecos may become dangerous to other fish if the tank is overcrowded.
    • Don't try to house multiple plecos in one tank as they will likely fight and kill one another.
  2. Plecos will get most of their diet from the algae on the fish tank walls. However, plecos have a need to gnaw on driftwood to provide extra nutrition. Make sure your tank has some driftwood placed in it to provide a proper and healthy environment for your pleco. [12]
  3. Plecos will love to have plenty of hiding places in the aquarium. These spaces can help make your pleco feel more relaxed, give them a place to rest and prevent aggressive behavior. Make sure your tank has a few areas where your pleco can take a break and get some rest. [13]
    • Adding in some pipes or tunnels can be a good idea.
    • You can find many different styles and types of cover for your pleco at most pet stores.
    • Make sure you securely position any plants in your aquarium. Pleco fish will easily uproot and destroy any plants that aren't securely rooted.
  4. Like most fish, plecos will have a specific range of temperature and pH levels that they can comfortably live in. You'll want to take careful measurements of both the tank's temperature and pH levels before adding in your pleco. Levels that are too high or too low may cause your pleco to become unhealthy or even die. [14] [15] [16]
    • Plecos will do well in tanks that range from 68-84 degrees Fahrenheit.
    • pH levels can range between 6.5 and 8.
  5. In their natural environment, plecos enjoy fast moving water and strong currents. While you won't be able to emulate the full strength of the pleco's preferred current, you will want to have a high powered filter. Providing a constant water current in the tank will help your pleco feel comfortable and at home. [17]
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Part 3
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Adding Your Pleco to the Tank

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  1. The first step in introducing your pleco to the tank will be to simply place the entire bag into the tank. Adding the bag that contains your pleco to the tank will gently match the temperature of the water in the bag to that of the tank's water. This will help your pleco avoid any shock that can come from large temperature differences in the water. [18]
    • Keep the bag closed when placing it on the water's surface.
    • Let the bag sit for at least ten minutes.
    • Make sure none of the water in the tank or the bag are able to mix.
  2. Once your pleco has been floating on the surface of the tank water for a while, you can start adding tank water to the pleco's bag. Adding water will help to gently introduce the pleco to the temperature and pH levels of the tank's water. Adding the tank water to the pleco's bag is an important step and will help avoid potential health risks to your pleco. [19]
    • Wait ten minutes between adding more water to the bag.
    • Keep the bag sealed to avoid the uncontrolled mixing of tank and bag water.
    • Do not let the bag's water spill into the tank.
    • Eventually, the entire bag will be filled with tank water.
  3. After the bag has been filled with tank water and the pleco has had time to acclimate, you can scoop it out with a net and put it in the tank. Open up the bag and put your net in to catch the pleco. Put the net and the pleco into the tank and allow it to swim out of the net. [20]
    • Don't dump the pleco out into the tank.
    • Do not mix the bag water into the tank water.
  4. Now that your pleco is at home in the tank, you'll want to keep an eye on all of your fish. Your pleco will likely adjust with no trouble. However, your pleco may attack or try to feed off of your goldfish. You will need to keep an eye on the behavior of all your fish to make sure they are getting along well. [21]
    • Goldfish have a film around them that plecos may try to eat.
    • Look for red marks on your goldfish. These marks can indicate your pleco is feeding from the goldfish.
  5. Although plecos will be happy to eat any algae or plants they find in your aquarium, they will still require you to give them food. Adding in these additional food items will help ensure that your pleco is getting the nutrients that it needs. Try offering some of these food items to help keep your pleco happy and healthy: [22]
    • Large plecos can eat tiny bits of shrimp or fish.
    • Vegetables such as salad, cucumbers or squash can be given to your pleco.
    • Spirulina tablets can be given to your pleco.
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Community Q&A

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  • Question
    Does it matter what type of golfish I have in the tank with the pleco?
    Dieyun Ding
    Top Answerer
    No, most goldfish generally react similarly when interacting with other fish. Most likely, your specific breed composition will not affect how well the pleco does in your tank.
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    Not Helpful 2 Helpful 7
  • Question
    Why does the pleco go near the goldfish?
    Community Answer
    Fully grown plecos will sometimes suck the slime coat off goldfish. Be careful of that, and watch the goldies and plecos carefully.
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  • Question
    I have 2 plecos in a 75 gallon tank with goldfish. One pleco has his fin up on the back, the other one doesn't. What does that mean?
    Community Answer
    It doesn't mean anything unless the pleco with its fin is up acting funny or showing signs of illness. The fin up is usually a territorial behavior.
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      Tips

      • If your pleco is causing difficulties in the tank, you can try adding more hiding spots to lower aggression and make it feel more comfortable. [23]
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      The advice in this section is based on the lived experiences of wikiHow readers like you. If you have a helpful tip you’d like to share on wikiHow, please submit it in the field below.
      • Bristlenose plecos only grow to about 8 inches (20cm) in maximum length, and they do well in a 20-gallon tank. If you have a smaller tank, these plecos are a good choice.
      • Feed plecos at night because sometimes they won't eat during the daytime.
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      References

      1. ↑ http://plecostomus.org/
      2. ↑ http://www.fishchannel.com/fish-magazines/aquarium-fish-international/july-2010/picking-a-plecostomus.aspx
      3. ↑ http://animals.mom.me/algaeeating-fish-can-goldfish-6293.html
      4. ↑ http://www.fishchannel.com/fish-magazines/aquarium-fish-international/july-2010/picking-a-plecostomus.aspx
      5. ↑ http://www.aquaticcommunity.com/pleco/common.php
      6. ↑ http://www.fishpondinfo.com/fish/plecocare.htm#suck
      7. ↑ http://plecostomus.org/
      8. ↑ http://www.fishchannel.com/fish-magazines/aquarium-fish-international/july-2010/picking-a-plecostomus.aspx
      9. ↑ http://animals.mom.me/habitat-plecostomus-3481.html
      1. ↑ http://animals.mom.me/can-multiple-plecostomus-put-same-tank-11126.html
      2. ↑ http://www.aquaticcommunity.com/pleco/common.php
      3. ↑ http://www.aquaticcommunity.com/pleco/common.php
      4. ↑ http://www.aquaticcommunity.com/pleco/common.php
      5. ↑ http://animals.mom.me/habitat-plecostomus-3481.html
      6. ↑ http://www.fishchannel.com/fish-magazines/aquarium-fish-international/july-2010/picking-a-plecostomus.aspx
      7. ↑ http://www.aquaticcommunity.com/pleco/common.php
      8. ↑ http://animals.mom.me/habitat-plecostomus-3481.html
      9. ↑ http://www.hartz.com/Fish/Habitat/How_to_Introduce_New_Fish_into_Your_Aquarium_Tank.aspx
      10. ↑ http://www.hartz.com/Fish/Habitat/How_to_Introduce_New_Fish_into_Your_Aquarium_Tank.aspx
      11. ↑ http://www.hartz.com/Fish/Habitat/How_to_Introduce_New_Fish_into_Your_Aquarium_Tank.aspx
      12. ↑ http://animals.mom.me/algaeeating-fish-can-goldfish-6293.html
      13. ↑ http://www.aquaticcommunity.com/pleco/common.php
      14. ↑ http://www.liveaquaria.com/PIC/article.cfm?aid=170

      About This Article

      Article Summary X

      To introduce a pleco to a goldfish tank, make sure you purchase a non-aggressive pleco species, like a rubber-lipped or longfin bristle nose pleco, so it doesn't attack your goldfish. You'll also need to transfer your goldfish to a tank that's at least 2 feet long if they're not already in one since plecos can grow quickly. Then, places some shelters in the tank for your pleco to hide in, as well as a piece of driftwood so your pleco has something to gnaw on. To learn how to feed your pleco, scroll down!

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