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Hey guys,

I'm just wondering why some of my Cories are not growing to there normal size they should be.

I have 16 Cories and nine of those I got over a year ago and they haven't grown much. My three C. trilineatus are only about 1.3-1.5 inches long, my one C. acrensis is about the same, my four C. aeneus range from 1.5-2.0 inches, and my one C. paleatus (I have another Peppered but I just got it)is about 1.2 inches long. Why are they small? I feed them many varieties of food, the tank they are in is not over stocked, and the tank has good water quality.

Thanks for any help

CL1

Although it is not guarantee but few info like water parameter(temp, ph and hardness), tanks stock, tankmates and maintenance schedule(water change, feeding as well as the info of filter).
Also this could be a long shot since not one but most of your Corys are not growing much but they could be some of the runts. But it is not one. So also, I would like to know where you got your fish from.

Maybe some one can pin point your problem if you can share more information.

NEONCORY wrote:Although it is not guarantee but few info like water parameter(temp, ph and hardness), tanks stock, tankmates and maintenance schedule(water change, feeding as well as the info of filter).
Also this could be a long shot since not one but most of your Corys are not growing much but they could be some of the runts. But it is not one. So also, I would like to know where you got your fish from.

Maybe some one can pin point your problem if you can share more information.

Hi,

Ok, the temp ranges between 25-26C and the ph is about 7.2.

Its a 54 gallon tank and has 16 Corydoras, one old peaceful CAE, three Upside-Down Catfish, two peaceful Convicts (I know its hard to beleive Convicts can be peaceful, but my almost five year olds are), and five Zebra Danios.

I change the water about every week and a half. In the moring I feed the my fish flakes, and at night my fish get shrimp pellets, Hikari Sinking Wafers, veggie or NLS wafers, freeze-dried tubifex worms, veggie flakes, and some flaoting pellets. Also once a week they get blood worms.

The filter is a AquaClear.

I got my Cories from small pet stores, no big chains.

BTW, all my Cories have very long barbels, have good colouring, and are active. The only problem is their size.

CL1

bump lol

How long have you had the Corys?

I find that Corys in the main are slow growers at the best of times. They are long lived and once they reach maturity, which can be anything from 6 to 12 months they still keep growing, but seem to slow down. I have several species , which are several years old, but are still growing.

I would increase the frequency of the water changes and to make sure the Corys are getting enough food I would put in a little pre-soaked flake food last thing at night after the light go off. I pre-soak the flake so that I sinks and gets down to the Corys straight away.

Ian

I am curious if you know that they are getting their share of the food. Some of the fish you have listed can be rather fast and voracious at feeding time. It may also be to your advantage to feed the other fish a floating food, and after 10-15 minutes drop something in that will sink to the corys. That should eliminate at least some competition for food.

Larry Vires

Hi,

They get enough food with out a doubt.

The Upside-Downers don't come out until its dark (most of the Cory food is gone by then), the Convicts stick to the other side of the tank were the Cory food does not fall, the CAE is strictly algae, and the Danios will only eat flakes (don't ask me).

The Cories eat about 70% of the food given. And they get good qulaity food.

I just realized all my nine 'small' Cories came from the same place, hmmmmmmm.

I got the Cories just over a year ago.

CL1

Update:

I'm seeing some growth now. I measured my Coreis last night and here are the results:

One Female Zygatus is 3in.

Two Zygatus Males are 2in.

Four Aeneus are between 1.8 and 2in.

Two Schwartzi are between 1.8 and 2in.

Three Trilineatus are between 1.5 and 1.7in.

One Acrenis is 1.5in.

One Cervinus is 1.5in.

Two Paleatus are between 1.5 and 1.9in.

CL1

from conducting a small test on some of my own tank bred corys, i found that those that were placed in a cory community tank with 1 water change a week grew ALOT slower than those in a nursery tank with daily water changes.

when i say they grew alot slower in community tank i mean about 80% slower. i have just moved some to another tank and they are still about 2cm long after 4 months.