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100percentmaybe 02-16-2011 05:28 AM

Cory Behavior
 
I started a 20 gallon aquarium this past week and added 3 cory cats to it on Monday. The first day they all hid down at the bottom, but all last night and this morning it seems like they are swimming all over the place. They go over to the bubbler, let it push them up to the top, then they swim over to the filter and let the water coming in push them back down to the bottom. They also swim up and down the sides. My first thought was that they are playing with their reflections, but it does look like they are going to the top for air quite a bit.

I checked my water last night and it looks like the pH might be kind of high? I don't really trust test strips, so I'm going to bring some to work and check it myself today (woooo science!), but if it IS high, what should I do? I don't know if I want to start messing around with dumping chemicals in the water. Its possible that the store I bought them from does water testing as well, so I might bring a sample in to have it checked.

Maybe they are just really active? I'm just surprised b/c I thought they were going to hang out at the bottom and they aren't really doing that.

SeaHorse 02-16-2011 07:44 AM

Hi, there, sounds like 3 little Corys doing what Corys do! Yes they are fun little creatures to watch, yes they go to the surface at times, seem to gulp air and go back to the bottom. You didn't say if you got all the same type or three different kinds. I have 6 in a 75 gallon, and they are all different species, well two are peppered. They say they like to be in groups of 5 of their own kind, some say 3-5, depends on the breed. Mine all greeted each new comer to the tank and off they went together. But now they are all independant of each other... the two peppered do stay close to each other.
Just beware you have a very new tank that will have to cycle. 6-8 weeks. Is this your very first tank or like most of us you have just added another to your collection? Good luck, enjoy!!

Grimmjow 02-16-2011 08:01 AM

Unless your ph is something extreme dont mess with it, the fluctuations with chemical will do more harm than good.

Ive got 5 in my 75g and they are almost always swimming all over, sometimes they just sit there and stare but usually swimming up and down the glass or across the tank and shooting up to the top for air.

Investing in a liquid test kit is pretty important.

fishingfor2001 02-16-2011 08:51 AM

I also have three cory's. This is normal behavior. They are very active.

DKRST 02-16-2011 10:21 AM

I found C. aneus (these are often the albino form sold) to be more active than my peppered corys. Sometimes they act positively hyper up and down the tank sides all day long. The peppered corys in my tank show the same behavior, but not as frequently.

100percentmaybe 02-19-2011 01:59 PM

Thanks
 
Thanks for the advice, looks like my cories are doing just fine...they just like to play! I checked on my water and everything appears to be normal, so I am not worried about that anymore.

I have three and I am wondering if they would do better in a larger group? I'm also not quite sure what type of cory they are...they might be peppered but they have a black mark on their dorsal fins which I'm not seeing in the pics here?

jeaninel 02-19-2011 04:28 PM

Post a pic of your cory and we can try to identify it for you.

I would get 3 more to make a group of 6 for your 20 gallon.

1077 02-20-2011 12:17 AM

Quote:

Originally Posted by 100percentmaybe (Post 594861)
Thanks for the advice, looks like my cories are doing just fine...they just like to play! I checked on my water and everything appears to be normal, so I am not worried about that anymore.

I have three and I am wondering if they would do better in a larger group? I'm also not quite sure what type of cory they are...they might be peppered but they have a black mark on their dorsal fins which I'm not seeing in the pics here?

Your tank has not cycled, and I would not add any more fishes for the next three to six weeks, lest rising ammonia levels from waste created by fish, and fish foods offered begins to kill the fish which in my view,WILL be the result.Would test the water daily, and be prepared to change 40 to 50 percent of the water any time ammonia levels rose above .25 according to test kit.You do have a test kit no?
Unless you have borrowed some seed material from an existing established aquarium,,your tanks biological filter will NOT allow the safe addition of more fishes at this time.
What are NORMAL as you say readings for ammonia,nitrites,and nitrAtes at this time?

jeaninel 02-20-2011 12:31 AM

Ooohh...good catch there, 1077. Yes, wait for your tank to cycle first before adding anything more. Cories should really be added to a well established tank. They do not handle a cycling tank well.

Eylisia 02-20-2011 12:53 AM

Corys are very active, and they will not stay on the bottom unless they are in groups and there is food to find in the gravel/sand. They do not group with different types unless they feel a need for protection.

Edit: Always cycle a tank with only a few fish, so please don't add any more yet.


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