I have three cories in a 30 gallon tank. The only other fish in the tank right now are neons and otos, and the stocking density is light. Two of the cories act perfectly normal. One originally did, but within the last week or so has taken to swimming frantically up and down the glass. I've never seen a fish swim so frantically in my life. I've tested practically every water parameter known to man (Ammonia, nitrite, nitrate, phosphorus, iron, CO2, pH, gH, kH...), and they are all perfectly fine. The tank is heavily planted with live plans and DIY CO2, but the CO2 is supposedly in the low range (lower than it should be for the plants) and all the other fish are acting perfectly normal. The other cories are as laid back as can be, and I can see nothing physically wrong with this fish. Occassionally he calms down and stops pacing, but he seems to spend the majority of his time doing this. Any idea what's going on?
2007-01-10 09:04:45 · 13 answers · asked by devouring_wind 4 in Pets ➔ Fish
I feed him and he eats with the others. It's one of the few times that he doesn't pace around. Do you think they're not letting him get enough food? They don't seem very competitive at all.
2007-01-10 09:14:01 · update #1
Interestingly enough fish can not tell their reflection from another fish, my corys tend to try to get into the background thinking its open water, also if you notice yoru corys have two "nostrils" and will dart up to the top of the water and suspend their heads above the water, why? because tehy can breath air using a laberinth organ like guoramis or bettas.
2007-01-10 14:56:04 · answer #1 · answered by Shawn W 1 · 1⤊ 0⤋
I'm serious man all fish do this. I have a 30 gallon tank lke you do and My tiger barbs don't do anything BUT this. The whole day they follow their reflection on the glass. From the inside of a tank theres alot of reflection.
2007-01-10 10:03:44 · answer #2 · answered by lilgman424 2 · 0⤊ 0⤋
I'd say he's got an infection and you better get some medicine quick. A good tropical fish store could tell you which virus he has and what medication to put in the tank.
2016-05-23 06:28:13 · answer #3 · answered by Anonymous · 0⤊ 0⤋
all fish do this, it's just a game they play i guess. My gold barbs, my betta, and my ram cichlid all do this, but my barbs go real fast to the top of the water, lift a bit of water from the surface and shoot back down, it's not anything to be worried about. This fish is probably just more active than the others.
2007-01-10 09:35:28 · answer #4 · answered by Flames Fan 3 · 0⤊ 0⤋
hehe, It's just the way that they swim/school when they are happy. I have a shoal of 3 also and their swimming behavior is what makes me love them so much.
I'm trying to order more, julii corys are pretty rare where I live.
They will swim a ton more like that when they have 6 or more in their shoal (group). Its just the way they travel. They will often replicate exactly their shoal mates' movements. =D
2007-01-10 16:00:10 · answer #5 · answered by Chafed 3 · 0⤊ 0⤋
They will eat algae clinging to the sides, as well as gather oxygen bubbles that adhere there as well, also if they notice you feeding them they may be trying to get your attention for food, but they dont always need food when they do this, so don't overfeed because you think your fish is begging.
2007-01-10 09:14:27 · answer #6 · answered by digitalwrangler 3 · 0⤊ 0⤋
I have seen this other corys too. I think he is looking for food. I have seen it also if there is a lot of water movement in the tank. I read an article that said they do this when there are ready to breed. read the fifth paragraph of this link.
http://www.articlefishtalk.com/Article/Breeding-The-Corydoras-paleatus-By-David-Fischer/198
2007-01-10 09:15:23 · answer #7 · answered by Anonymous · 0⤊ 0⤋
lol i used to have a cory cat and a chinese sucker in my community tank with a few others.... they were hillarious. both of them did that, constantly..... first, one would chase the other, then the other way around, it was great. they lived long healty lives...... i wouln't worry about it, he's probably just playin.
good luck!!
2007-01-10 09:32:21 · answer #8 · answered by Silver Thunderbird 6 · 0⤊ 0⤋
Most likely it's just attracted to it's reflection. Changing the lighting may help.
2007-01-10 11:57:04 · answer #9 · answered by Anonymous · 0⤊ 0⤋
my gourami does this and it's quite healthy. It's probably just a particularly active fish. Don't worry at all.
2007-01-10 09:41:02 · answer #10 · answered by allyalexmch 6 · 0⤊ 0⤋