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Old 02-04-2011, 03:28 PM   #1 
LolaQuigs's Avatar
Join Date: Mar 2010
Location: MO
Questions about stocking cories

I know there are a lot of threads floating around about cory cats, but I did a quick search and didn't see any that answered my specific questions.

1) Certain kinds of substrate are safer for their barbels; people say sand or smooth gravel. I would like to avoid sand because I am afraid it could damage the filter, and the cories might push food and whatnot down into the sand, and that would be difficult to vacuum out. So that leaves me with smooth gravel....Maybe I haven't looked closely enough, but all of the gravel I've noticed looks pretty much the same. Does anyone have a picture or a brand of gravel they would recommend for cories?

2) I'd like to add four and a betta to my 10 gallon tank. Should I add them one (or two) at a time so the bioload doesn't get thrown off? Or should I add all four at the same time so they don't get lonely?

3) People recommend quarantining new fish. How big of a quarantine container should cories have? Should it have substrate and/or hiding places, or should it be completely empty? If I stock multiple cories at the same time (depending on the answers to question 2!), can I quarantine them together, or should each have its own container? Do I need to heat the quarantine containers, or will a cory be ok with room temp for a week or so?

4) I am dealing with ich on a betta I got about two weeks ago. I am treating her with heat and salt, and she is improving. I know cories can't withstand salt, so if they end up with a disease like ich, how would I treat it? I know this question is more conditional than the others; hopefully the cories I end up getting will be healthy upon purchase, but dealing with it on my betta just got me wondering.

5) Cories are more sensitive to water parameters than bettas. Does this go for pH too? Mine is quite low. What is the ideal pH range for them?

[EDIT: already thought of another question!]

6) Should they be kept in groups of the same species, or will they still schoal/be happy if I have a couple of different species?

I'm sure I will have more questions as I get closer to stocking this 10g, I am a long way off. I was trying to cycle but it wasn't working. I'm going to try cycling again, and figured I may ask about this now, especially for question 1, so I can get cory-friendly substrate before I restart the cycle.

Last edited by LolaQuigs; 02-04-2011 at 03:32 PM.
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Old 02-04-2011, 08:49 PM   #2 
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Join Date: Jul 2010
Location: Orange County, CA
I didn't read the whole thread but I can answer a couple questions. I use sand and it doesn't damage the filter, and corys don't push food down in the gravel. Sand is cheap, but gravel can be VERY expensive. You should add them all at once. I never QT my corys. As long as they are healthy and there are no other sick fish in the tank. For QT you would need an airstone or filter, and a ten gallon rubbermaid aquarium. I don't know about treating them (mine have never gotten sick), but most medicines say "for scaleless catfish, use half dose", so just check the med. You could get 2 of each species and they will be happy. Although the more of the same species you keep, the more bold they are.
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Old 02-06-2011, 12:00 PM   #3 
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Join Date: Dec 2010
I added six panda cories, 6 elegans cories, and 2 (4 were doa) three lined cories to my 55 gal. The two three lined often swim with either the elegans or the pandas. The six elegans generally stay together. The pandas move around a lot, sometimes 4 or so are together but frequently they are all over the aquarium. I think you should get at least six cories, but from my experience, at least the three lines seem comfortable with other cories.

I have about 1/3 sand substrate and 2/3's gravel. I used a small divider and after two and one half months, everything is still pretty straight. However, I certainly do not see the cories having a preference for the sand.

If you can get the really small gravel, 1 - 2 mm that is often mentioned on this site, you would have the best of both worlds...although I have never found any of that size locally.

good luck
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