pygmy cory question

davcheng

AC Members
Jul 31, 2007
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i have 9 pygmy cories in a 10g planted tank. They are ALWAYS hiding in one back corner by a large sword plant and rarely move at all during the day/night. Is this normal? I was under the impression they would go around all over the tank, but they seem to hide out, unless scared by my hand going in (to move plants/prune) and then they will quickly dart around the tank and settle in some other corner where I can't see them well. I was just wondering if this was normal and if there's any way for me to get them to come out. They do not seem to seek food when I toss down either an algae wafer or the wafers made for catfish (hikari brand for both), and I never see them eat.
 
When did you buy them? It's really unusual for cories to be like that. What are your water parameters? Did you acclimate them and if so, how?
 
I got them about 3 months ago, and I don't know about the water parameters. I figure it would be ok since I do weekly water changes (about 20-25%), and I have a canister filter rated for 30g (marineland c-130 I think) going on it and also a whisper 10 HOB. They used to be more active when I only had 3 of them (thats all the LFS had when I first got them), and then I figured they'd be happier with more, so I got more of them, but then they got less active.
 
Thats rather odd... I would suggest checking up your water parameters even though you think the water's okay... better safe than sorry dav. And who knows, maybe they may need some time to adjust to your tank?
 
Yeah true. I'll have to go out and get a test kit some time. I was just hoping there was some trick to make them act more like the cories I saw at the LFS instead of the hiding ones I have.
 
??? Is there other fishes in the tank?? (something harassing them). Lights too bright and not enough places to hide?? Which pygmy cory?? Hastatus or Pygmyous (hope I spelled that right).
 
My pygmy cories seem to care about the size of the tank (bigger is more likely to make them visible), hiding spaces (only one is more likely to make them invisible), other plants (some small foreground plants are more likely to make them visible). Other inhabitants don't seem to matter (alone vs with one or two other peaceful fish in a small tank), since like most cories, they mostly ignore everyone else.

I have about 15 in a 10gal with a betta, and I see them a lot.
 
??? Is there other fishes in the tank?? (something harassing them). Lights too bright and not enough places to hide?? Which pygmy cory?? Hastatus or Pygmyous (hope I spelled that right).
Hi tanker,

It's C. pygmaeus.:)
 
Thanks Lupin. Was never good at spelling.
 
Yeah I have C. Pygmaeus the lights are pretty bright (40 w) for the plants. I have some type of grass plant (Sagittaria subulata?) growing in the foreground, and a bit of glosso. There's one large sword in one corner, and another one in the other corner (with a small piece of pvc and a piece of upright driftwood on a slate). They tend to stay away from the side with the pvc. They are with four harlequin rasboras and four glowlight tetras and a female betta. There's also a few cherry shrimp in the tank. Temperature is at 75 degrees fahrenheit.
 
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