Common Pleco – The Care, Feeding and Breeding of Common Plecos

common plecoQuick Stats

Minimum Tank Size: 55 Gallons (75 Gallons Recommended)
Care Level: Easy
Water Conditions: 6.5-7.5 Soft to Medium
Temperature: 72-86 F (23-30 C)
Maximum Size: 24 inches (60 cm)

The common pleco (Hypostomus plecostomus), also known as the sucker fish, is a staple of the aquarium hobby, and is easily one of the most popular fish available. They are found throughout South America, and have in recent years been reported as an invasive species in several countries, most notably in the several southern United States.

Their natural habitat consists of streams and rivers and they are also found in shallow, low oxygen ponds during the dry season. They tend to prefer slow moving water with sunken driftwood and plants that provide shelter during day. The reason that they shelter for much of the day is that they are nocturnal and are rarely active during daylight hours – a behavior that you can expect in the home aquarium. While many will become more active during the day after being kept in captivity for several months, they should always be provided with adequate hiding places such as caves, rock over-hangs or large pieces of driftwood.

Many of the plecos for sale in pet stores are juveniles, and don’t be fooled into thinking that they are a small fish. While most are sold in the neighborhood of only one to two inches, they quickly grow to aquarium busting sizes. It’s not unusual for a pleco kept in proper conditions to reach over 24 inches (60cm) in length – a size that will overwhelm most aquariums.

If you are looking to pick up a male and female pleco for breeding purposes, then you are about to be disappointed. They are incredibly difficult to sex, and while many people claim to have a system that can easily sex them based on their size, or the shape of their fins, it’s nearly impossible for the average person to determine their sex.


Because common plecos can grow to such massive sizes in the home aquarium, only the very largest of aquariums can be used to house fully grown adults. They can be kept in smaller aquariums while they are juveniles, but should be moved to at least a 55 gallon aquarium as soon as possible. And even with a 55 gallon aquarium, they will often become too large to turn around in the tank, and should be provided with at least a 75 gallon aquarium, with 100 gallons being preferable.

Something else to keep in mind when choosing an aquarium for a common pleco, is that they are known to become extremely aggressive when they reach adulthood. While juveniles are generally an excellent community fish, any adult plecos should be kept in a semi-aggressive tank, and should never be kept with any other common plecos. They can occasionally be kept with other species of plecos, but this can be hit and miss at the best of times and should be avoided if you don’t want to risk a fish fatality.

Their large size, and equally large appetites should be considered when choosing a filter, and any fish tank containing a common pleco should be heavily over-filtered. It seems their one goal in life is to eat and poop, and they will put a strain on even the best filter. The best way to keep up with their enormous bio load is to use an HOB (hang on back) filter in conjunction with a large sponge filter.

I would strongly recommend choosing an Aquaclear Power Filter for a common pleco tank. This filter combines excellent filtration with a durable design, and it will keep your tank sparkling clear for years to come. You can also read the Aquarium Tidings Aquaclear Filter Review here.

However, if you have access to a larger budget, then common plecos are a prime candidate for canister filters. These are usually the best option, and will keep the water sparkling clean even in tank with a prolific poopers like common plecos.


Most people will tell you that the common pleco is a sucker fish, and can live off algae alone. Unfortunately, nothing could be further from the truth, and this belief leads to many underfed and malnourished plecos. They are actually omnivores, and eat plant material, algae, insects and small crustaceans in the wild.

This diet should be reproduced as closely as possible in the home aquarium, and they should ideally be fed algae wafers and a high quality flake food. They can also be fed frozen foods, with bloodworms being the best option since they sink, and are easy for plecos to catch. One of the best algae wafers to feed them are Hikari Algae Wafers and I use them for all of my plecos.

It is also important to regularly feed them a variety of fruits and vegetables. Their favorite foods are blanched zucchini medallions, shelled peas, cucumber and any soft melons. But you can always experiment and try different fruits and vegetables, and they will also greedily accept broccoli, lima beans and a wide array of other vegetables. With that being said, they should never be fed any acidic fruits or vegetables (oranges, grapefruit, tomatoes, etc.)

Common plecos require a large amount of fiber in their diet, and regularly feeding them vegetables helps them to obtain most of their required fiber. But to be sure that they are getting enough fiber in their diet, they should always have access to driftwood in their tank. They will constantly rasp on the driftwood, ingesting tiny pieces of wood which helps with their digestion. If they aren’t provided with driftwood, they can become seriously ill in a short period of time.


Breeding common plecos is incredibly difficult and only a small number of hobbyists have ever successfully bred them. If after reading that, you would still like to give breeding a shot, then the first thing that you need is a very large tank. Since adult common plecos are notoriously aggressive, the minimum size tank for breeding adult plecos is approximately 100 – 200 gallons.

The tank should contain as many hiding places as possible to reduce aggression, and a cave like hollow should be built into the tank. Some people report success with large clay pots on their side, but the truth is that it is hard to mimic the river bank caves that plecos breed in in the wild.

Once the male has chosen a “cave” to breed in, it will meticulously clean the sides and attempt to attract the female into the cave. If the female is enticed in by the male, it will deposit eggs on the side of the cave, and the male will then set about guarding the eggs until they hatch.

The eggs will generally hatch in few days, and the fry can be feed infusoria for the first few days, and then will accept most commercially available fry foods and baby brine shrimp. They will also accept spirulina powder, but too much of this can quickly foul the water.


    • says

      The vegetables should be well cleaned, and then blanched. To blanch them, boil them for just a few minutes (usually 1-3) and then let the vegetables cool before serving. They just need to be softened up slightly, so make sure that you don’t overdo it.

  1. Norm says

    Hypostomus plecostomus is often called “common” pleco, but it isn’t. Nor are several others that often get called “common”. The true “common” pleco is (by code) L021 Pterygoplichthys pardalis which do not get as large (about 10″ to 12″ in a medium sized tank) and do well in a community tank (unlikely to eat your other fish). Anyway, good article except for the very, very common identification issue I have — call it nit-picking if you will. :) Oh, and some pleco do very well on a near algae diet…I had one I never gave special foods to; he may have scraped some drift wood or dined on missed flake food that floated to the floor — but I never saw him eat any of that or any of the Java ferns. I carefully allowed algae to grow on 3 sides of the aquarium and kept things pretty tidy. He was over 25 years old when he died (normal lifespan is about 15 years).

    • says

      I’ll definitely look into this, and correct it if need be. Do you have any sources I could reference?

      And that’s pretty impressive with the pleco. Most of my plecos have gotten a taste for fish food, so I wouldn’t be surprised if he stole some now and then. I often keeps rocks in rock near the window to grow algae, and cycle them through my pleco tanks. It’s a great way to give them some extra algae to eat.

  2. LeAnn says

    Not sure what mine is called but have always just given him wafers . I feel bad just been reading and seeing what they should be eating. He is 16 yrs old. We got him some driftwood just yesterday and he seems to love it. We originally bought him to clean the tank that we had for other fish and eventually everyone died but him so we just kept him. Now he’s our He’s about 14 inches long. I bought bloodworms too but haven’t seen him try to eat them. They float….how do I get him to see it?

    • says

      I wouldn’t worry too much – you must be doing something right if he’s lived that long. And most pet stores sell them as algae cleaners, without really telling people how to care for them. As for the bloodworms, eventually he should begin to notice them. Mine would often swim upside down at the surface to hoover them up. I also train most of my fish to know that it’s feeding time by lightly tapping on the glass. So when I tap on the glass, most fish will come up to the surface to be fed. You can try that also if you’re concerned about your fish not getting the bloodworms.

  3. LeAnn says

    Thanks Matthew I’ll start doing the tapping. He’s the only fish I have in the tank. Yes when I got him he was like 79 cents…just bought two to clean the tank and I wasn’t told anything but feed the wafers and I had to ask that. One day the top was left open and the next morning one had jumped out and was dead on the floor. So we knew nothing about them growing so large but I love it. My focus is now on keeping him healthy. Should I get another kind of fish for company? He’s been alone for so long . I did read not to put another placo in. Years ago we added a couple little fish and o think he killed them.

    • says

      Plecos can start to get fairly aggressive as they age to certain types of fish – mainly larger, wide body fish. And a mature pleco would not tolerate another pleco unless you have a huge tank where they can both set up territories. They aren’t a schooling fish, so they have no problem being alone in the wild, or at home.

  4. Jared says

    I recently found that my pleco had laid eggs when I decided to move my tank. Because I didn’t want to disturb the process I left them in the tank when I cleaned and moved it. I had removed all my other fish. It’s been about a week since I moved it and the male left the eggs for about 3 of those days. The female then returned and now the male is on the eggs again. I’m hoping to see results. Great article.

    • says

      Rubber lip plecos tend to be much less aggressive than common plecos, so it can be really hit and miss when keeping these two species together. Sometimes you may experience aggression, and other times you may not. With that being said, if you have a tank large enough to keep both of these large fish in it (100 gallons plus), then any aggression issues shouldn’t be too serious. You absolutely need a large tank though, since anything as small as even a 55 gallon tank would be too small for the common pleco alone, and the rubber nose will also grow quite large (7 inches plus).

  5. Leigh says

    Help, I have 3 Plecos, 2 Orange and 1 Brown ? A fortnight ago about a dozen + brown babies appeared and now orange one’s are appearing, 7 at last count. what do I do with them ?

    • says

      They wouldn’t be common plecos. You probably have bristlenose plecos. The orange ones are most likely albino plecos. I would feed them small pieces of algae wafers, and tiny pieces of lightly boiled zucchini. Any leftover food should be removed after 24 hours, since they are sensitive to water conditions. Also, I would keep up on your water changed, and even start to do two 10% changes a week. Newborn fry need pristine water conditions.

  6. Amanda says

    I have a smaller size tank, I have two pleckos in it and have I think 3 batches of babies. I don’t feed them anything special except the wafers, I have been trying to find some pet stores or people that would like some, any ideas on how to find any one that would like some?

    • says

      The absolutely best source I’ve found in the past are local fish forums. I know in my area there are several with sections for people selling fish locally, and bristlenose plecos are always in demand (which is what I’m assuming you have). Beyond that, if you’re in the states you could check out, and often works too. If you don’t want to go with any of those methods, I would check out all of the local petstores. While most often won’t pay you for them, they will often give you store credit which comes in handy.

  7. Megan says

    My almost 1yr old 30cm long pleco just LOVES peeled raw mushrooms! I just float them in the tank. It’s even refusing to eat zucchini which used to be it’s favourite!

  8. val says

    I have a pleco not sure what type it looks like a common one about 12 inches long. I wanted to know why he changes colour he is mostly dark spotted but every now and then his spots disappear and he looks white in’places.

    • says

      Turning white is generally a reaction to stress. I would check you water conditions, and check to make sure that the the temperature is in the ideal range. If both of those are fine, I would take a look at the tank size, and its tank mates. Is it with any aggressive fish? How often, and what are you feeding it?


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