Caresheet: Pygmy Cory

If you’re looking for a schooling fish with adorable looks that’s peaceful, fun to watch and can live in fairly small aquariums, look no further! Corydoras pygmaeus hastatus and habrosus, better known collectively as pygmy corydoras, have all these things and are therefore perfect for smaller community aquariums with 2-3 species. Keep reading for more info on how to keep and breed them!

Name

Corydoras pygmaeus, Corydoras hastatus and Corydoras habrosus. Pygmy cory, pygmy corydoras, dwarf corydoras

Natural habitat

South America, mainly Rio Madeira.

Corydoras hastatus

Tail spot pygmy Corydoras Corydoras hastatus by nanjenchan

Tank size 10 gallons (38l)
Temperament Peaceful
Diet Omnivore
Temperature 72-79°F (22-26°C)
pH 6.4-7.4
Length 1 inch (2.5 cm)

Appearance

Pygmy cories look just like most other Corydoras catfish, with the exception of the fact that they don’t grow bigger than 1 inch (2,5 cm). They are often mislabeled because they’re easily confused with one another and the terms ‘dwarf Corydoras’ and ‘pygmy Corydoras’ are used interchangeably.
Corydoras pygmaeus can be told apart by the stripe that runs down their entire body length, Corydoras hastatus has a black spot on the tail and Corydoras habrosus has spots along the upper back. The difference between female and male pygmy corydoras is usually not too hard to tell: females look rounder, especially when viewed from above.

Requirements

Pygmy cories are one of the only Corydoras species that can be kept in smaller aquariums; a minimum of 10 gallons (38l) is usually recommended. Like all Corydoras species, pygmy cories should always be kept in bigger groups (at least 8). When the shoal is not big enough, they will often become skittish and stressed. Providing hiding places, like some Java moss, can also help make them feel more at ease.
It’s very important to use sand in the aquarium instead of gravel. When cories are kept on gravel for too long, their barbels will wear down, leaving them unable to properly search for food or behave naturally. In bad cases this can even lead to rot, which is very dangerous that close to the face of the fish! Cories that are kept on sand are also just much more fun to watch; I often see my pygmy cories burying their faces up to their eyes into the sand when they’re foraging.
When choosing tankmates for your pygmy cories, keep in mind that they are very small and peaceful and won’t do well with bigger, more aggressive fish. Good tankmates include shrimp, small tetras and dwarf cichlids.

Diet

contrary to popular belief, Corydoras species aren’t algae eaters and can’t thrive on just plant-based foods – they actually need a lot of meaty foods in their diet. Pygmy cories can be fed frozen foods (bloodworms, mosquito larvae, brine shrimp), catfish pellets, flake foods and the occasional algae pellet, but make sure the food is small enough to fit into their tiny mouths or they won’t be able to eat it! Disintegrating wafers like these come in handy here and make a great staple.

Behavior

Pygmy cories show very interesting behavior and are fun to watch in the aquarium when they’re provided with a large enough shoal and plenty of hiding places. They shoal very well, only leaving the group to occasionally dart to the surface to gulp some air, which is a worrying sign in most fish species but completely normal in this case.

Contrary to most Corydoras, Corydoras pygmaeus don’t spend all of their time foraging on the bottom of the tank: they spend a lot more time in the middle water layer, which is something to be kept in mind when stocking the tank (two species in one water layer can look very messy!). They are also known as the more shy species of the three. Corydoras habrosus and hastatus mostly stick to the bottom and can be a bit more outgoing than their cousins.

Breeding: breeding Corydoras pygmaeus is not considered very difficult, although raising the fry can be a bit challenging due to their size. Spawning can be triggered by doing water changes with slightly cooler water; when the female is ready, the eggs will be deposited on the tank glass. The parents should then be removed, as they will try to eat the eggs. It’s also possible to remove the eggs and raise them elsewhere by gently removing them from the glass with your finger. Some eggs will likely start to fungus after a few days; these should be removed as quickly as possible so the fungus doesn’t spread. Interestingly, it is mentioned on Seriously Fish that dwarf shrimp will spot and eat any eggs with fungus quite quickly, while leaving the healthy ones alone.
Once the fry hatch they should be fed with very tiny foods like infusoria or crushed flakes until they are big enough to accept bigger meals.

I kept a group of Corydoras pygmaeus for a while myself and they were fantastic little fish. While they were indeed quite shy, once the plants in the tank grew and provided some cover I could frequently see them digging around the substrate and darting around. Definitely a fish I would recommend and keep again myself!

If you want to share your own experiences with pygmy cories or if you have any additional questions about keeping them, leave a comment below. Happy cory keeping!

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11 thoughts on “Caresheet: Pygmy Cory

  1. Hello,

    I’ve been looking into getting some fish recently and really love the pygmy cories and red rasboras. How many of each should I have with a twenty gallon tank (the tank has to be on the small side). I was thinking of maybe 8 cories, but I don’t know how many rasboras. Can these two fish live together peacefully if they’re introduced at a young age? Also, our their needs sinilar enough that they could both be stress free with the same heat, etc? For example, do rasboras mind sandy substrate? Do they need the same ph levels? If you think these fish would be difficult for a first time owner do have a specific species you’d recommend? I already looked at your list of beginner recommendations. Finally, on average how mich money will they cost me at first and then by year?

    Thanks,
    Andrew

    • I’m dreadfully sorry for my english. English is my fourth language after French, Italian, German y Spanish. English I learned in high school so I much worse conpared to the rest of my lagunages.

    • Hello!

      As for your other comment, your English is fine! It’s my third language as well :)
      Great to hear you’re doing your research, that’s the key to successful fishkeeping! The cories and rasboras are a good beginner choice and if you cycle your tank well before introducing them I wouldn’t expect any problems.

      In a 20 gal, I would go for a little more than 8 pygmy cories, maybe 10. They’re very small and they do better in a bigger group! Red rasboras (harlequin rasboras) are in my list of easiest beginner fish so they’re very peaceful. They can live together with pygmy cories just fine as far as I know, the species are from totally different continents but they’re both very peaceful and they both like a lower pH. They both have a wide possible temperature range (around 77 °F would be okay) and rasboras are not substrate dwellers so they don’t really care what substrate you use! A school of 8-10 would do well.

      I’m not sure how much your aquarium will cost, it depends on how warm your home is (how hard your heater has to work), how much you spend on plants, how expensive your pet store is etc. I always get my aquariums used – a used 20 gal costs around $50-80 here. A good filter costs around $25-30 and a heater around $20-25 (get an adjustable one for sure!). The fish are $2-4 each depending on your aquarium store. How much money you spend on plants and other equipment is mostly up to you, you can get good deals on used stuff as well. I always keep an emergency fund of $30 or so in case something goes wrong or fish get ill. Electricity costs here are 60 Euro a year (not sure how much that is in dollars!) for our 30 gal, water costs are minimal.

      Sorry about the wall of text! Good luck doing research and setting up your tank, I hope this helps but if you have any more questions feel free to ask.
      Mari

  2. Yes they definitely love to venture upwards, quite amusing! I really like the mosquito rasboras as well. I know they’re typically blankwater fish though. Would the Cory mind the black water?

    • I don’t think they would! The water in the video in this caresheet looks at least slightly stained as well, and most sources claim these cories do well with a pretty low pH (I listed 6.4 here). Looking at caresheets of both species, I think their natural habitats are actually pretty similar! You could try adding indian almond leaves, they stain the water a very nice color and are also sometimes claimed to help prevent fungus.

  3. Hi!
    While I don’t have these little guys, I do have a dwarf relative of theirs, Corydoras habrosus. And was wondering how many i could comfortably keep in a 10 gallon tank by themselves, or how many with another small schooling fish (tetras, rasboras etc).

    • Corydoras habrosus are indeed very similar (almost identical) to Corydoras pygmaeus. A 10 gallon is a great place to start! I’d go for 5-8 cories depending on the amount of floor space. When keeping them with other small schooling fish, keep in mind that these cories don’t just stick to the bottom of the tank but also use the other water layers. Things could start looking a bit messy, but with a small school of cories and a small school of maybe rasboras (I love love love mosquito rasboras personally) I think you’re fine. If you don’t want them all using the same water layers, you could also look into shrimp, snails and small fish like otocinclus.
      Good luck! These cories are fantastic to keep :)

  4. Ah, your video is so sweet! I have a group of bronze corys in my Amazon tank who spawn a few times each spring, and I recently added some pandas to the mix.

    Your tank is so beautiful. I have a large light over my tank, but I want to replace it someday with the spotlight-type lights to make the water look more natural while still allowing for my plants to grow (the Amazon swords in my tank are monsters).

    Keep up the wonderful work. Your pets must love you!

    • The video isn’t mine, unfortunately! I wish that was my aquarium, haha, I agree that it looks absolutely gorgeous with the darker water and dimmed lights.
      How do you like the panda cories so far? I’m interested in getting some cories for another tank but I’m not sure whether I should go for pygmies or pandas!

    • Hi!
      Although I have never seen my dwarf crayfish show any signs of aggression, I would not recommend this combo. I’m not sure how cories sleep at night, and if the crays will try to hunt them when they do. You could try it, but I unfortunately can’t guarantee succes! Pygmy cories and rasboras would do great with shrimp, though, if you really want to keep inverts. Amano shrimp and cherry shrimp are great cleaners and very interesting to watch!

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