Yet another Cory question LOL! - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 5 Old 10-07-2009, 01:49 PM Thread Starter
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Yet another Cory question LOL!

Hey Guys

I have a 20 Gal tank with a male betta, and 8 tetras, 3 diff speices, I was wondering if I could put a school of 6 pygmy corys in my tank? My betta is very good with other fish, he seems to like them?

I was gonna let my tank run for a couple weeks, and then introduce some corys?

What do you guys think?

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post #2 of 5 Old 10-07-2009, 02:33 PM
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Having never mixed Corydoras pygmaeus with a betta, I will leave it to the Betta specialists concerning compatibility. But if you do decide on pygmies, make sure the tank is well matured. If you have read a couple of recent threads on these fish you will note how sensitive they are to water parameters and quality. Like many others, I have lost them when introduced into newer tanks (within 2-3 months of setup), but never in tanks that have been running for several months and are biologically stable. A group of 6 (or more) is good. They do appreciate lots of plants, as they spend their days browsing over the surfaces of plant leaves, wood, rocks, much more than the substrate.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #3 of 5 Old 10-07-2009, 03:25 PM
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I have had regular corys with a male betta in a community tank with no problems but I have never had the pygmys. I don't think there would be a problem but like Byron said just make sure the tank has been running a while so you don't lose the cute little guys.

Kindest Regards,

Keeping fish its not a hobby it is a passion!

I have a 55 gallon, 40 gallon, 29 gallon, 20 gallon tank, 5 gallon , and a 2.5 gallon all with real plants.
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post #4 of 5 Old 10-07-2009, 03:30 PM
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A happy, healthy betta needs a temp of 77-86F. According to, pygmy cories do best in water that is 71.6-78.8°F...I'm thinking that might make them incompatable in itself.As Byron said, these guys are fickle about water parameters. I lost 4 pygmies out of 6 myself recently. I suspect my water was too warm, too hard, pH too high, and the tank was too new. In fact, out of all the corrys I researched, only 2 fit my water parameters...Sterbai and Oiapoquensis. Most cories just like cool, soft, water.
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post #5 of 5 Old 10-07-2009, 04:33 PM Thread Starter
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Thanks guys,

My setup has only beeen running for a hand full of days, the betta and tetras seems to be very happy and healty so far :) I onlt have two plants right now, One BIG fake one in the middle of the tank, and a small live one in my betta fav corner..I will have to give it some time i guess.


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