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I have a 180gal with about 10 different speiciesof corys and a few other types of fish there has been no new fish added to tank in 3months or more. but for the last week or so my 4 albino paleatus have been swimming in one general area but in mid. water they never really go to the bottom they just swim a circlular pattern they do drop down to eat but then come right back up. does anyone have a clue what's going on??
thank's
jerry

Jerry,
I noticed the same thing in a group of C. leucomelas I brought back a few months ago from the Rio Yavari, Peru. About two weeks later I noticed damage to their barbels and that they were sitting on the sponge filter and ignoring the substrate. I think that this may be an early warning of Cory barbel disease. I changed out the substrate and treated the tank with Binox and everything seems fine now.
-Shane

As Shane stated it is probably a substrate problem, I panic if I see any of my Cory's behaving like that.
I would lay money on it that the others are taking no notice of it at all, just the one species?

Just had a thought that it could be them getting ready to spawn, let us know if they do shortly?
Is there a change of air pressure occuring?

But why only on 1 species ? He had a few others corys species in the tank too.
So don't think is substrate problem.

My Corydoras concolor started doing that after i added a new powerhead to the tank. They don't do it all the time, they lie/swim around on the bottom most of the time. My other Corydoras species do it too, but not as much.

Hi!

I noticed that on different Cory species so far. Habrosus do it, my new Aspidoras also and the schultzei also. Mostly in the current in midwater. Imho it has either to do with no other free swimming fish around ergo the free swimming space...or they shoal with midlevel fish...just an idea

I have 7 C robinae and afaik those are definitely more of a midwater species compared to floorhuggers like aeneus, metae, melanistius etc etc. IME elegans is also more of a swimmer, but not to the level of the robinae. Nothing beats pygmaeus or even better hastatus, tough.

I checked there barbels they seem fine on all my cory's. But I did notice one is alot fatter than the rest wich are all pretty plump.I also noticed they NEVER seperate while all the other species school together they seem to stay away from everyone else.is this a spawning behavior?

sorry about the extra post, can't delete

Hi

Just curious, has anyone seen C. delphax this midwater swimming?
I've got three in a pretty filled up 190 litre tank and when they're not on the bottom they're swimming about the sides of the tank about halfway up.

Andy