Oscars and Convicts

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Thrower of Stones

Feeder Fish
Jan 22, 2012
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Buffalo
This is my first post here. I hope to become a regular, as I'm just getting really into the aquarium hobby and would like a place to enthuse!

Anyways, I recently got an Oscar. I read up a bunch about them beforehand, and one thing I read was that although they often do well alone, that convicts can make good tank mates for them because they are too big to eat at adult size and they are aggressive enough to hold their own against the larger oscar.

I work at Petsmart, so I bought my favorite of our current oscar brood, a small 3/4" albino tiger oscar who instead of the normal white with red spots was pink all over. I guess its probably an albino red oscar, but we were selling it with the albino tigers.

I also bought two convicts, one of which was about an inch and a half and the other about 3/4"s of an inch. I tried to get a male and a female, but I'm honestly not 100% sure.

It's been about three weeks, and the oscar is now 2-3" long. The convicts have not changed size at all. I knew oscars grew fast, but I didn't realize quite that fast! I'm starting to get afraid the oscar might get big enough to eat the convicts before they even get a chance to grow at all!

They are definitely eating, they just are not growing nearly so fast as he is.

Should I be concerned? Honestly the convicts seem a lot faster and smarter than the Oscar, so it could be they could just avoid him. He mostly just swims at the front of the tank wildly begging for food while they explore the tank, nibbling at my driftwood and such. Still, I'd rather not wake up one day to find them gone from the tank, since I've grown attached to them, especially the small one (who I suspect might not be full convict. His body is a little stubby, and he has really big eyes, like a parrotfish, but he doesn't have any other deformities like the mouth or the hump.).

I don't really have another tank to put them in, unfortunately. I have a 30 gallon but it has axolotls and african clawed frogs in it who would gobble them up in a second (they eat bullfrog tadpoles whole! No, this was not intentional.) Plus it is unheated right now, although in theory I could add a heater as the axolotls and frogs would do okay in the low or mid 70's.
 
The oscars will begin to outgrow the convicts soon. Especially if you did get a male and female, as once they begin to breed they grow a lot slower! I staggered stocked my tank. Purchasing the oscars last. Giving everything else chance to grow. My larger oscar is probably about 4" and the smaller one around 3" and when i introduced them into the tank they grew rapidly - like yours. However, they have slowed down now. So yours may too! Once the convicts get to about 2"+ they will begin to breed, and they will be able to hold their own against the oscars. However, it is then the problems will start as the growth rates will change, and soon enough the oscar may see them as food.

I imagine you wil be okay for a while yet. See how it turns out. I dont think there is any danger yet. Provide lots of hiding places for the convicts which are too small for the oscar. And keep your oscar well fed otherwise he may see the convicts as food.
If and probably when the oscar begins to see the cons as food you should IMO add some smaller fish such as danios or larger tetras, which he/she should see as more of a food source than your cons.

Finally, welcome to mfk.

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If the Oscar has been growing out with the Convicts and you don't feed him live food, I doubt he will try to eat them even if at some point they fit his mouth. Just keep him well-fed with a good quality pellet, I've seen large Oscars living with small fish just fine.

Fish are not their preferred food choice anyway, they are not Piscivores. They favor crustaceans and other small invertebrates, insect larvae, fruit and plant matter in the wild, with the odd catfish every now and then. It's immature fish keepers that offer them all kinds of feeders (even mice) just for their own excitement, and since a hungry Oscar will take anything you wiggle in front of the tank, they earned their reputation as fish eaters.
 
I would not put a oscar in a 30 gallon...
 
Welcome to the site, you should be able to tell if the cons are male and female by their colors. The female will have an orange belly. If they are a pair you may run into problems down the road. Breeding cons are very aggresive and may not work with an O down the road. Like stated before hiding spots are a plus, I have a female con (about 2 inches) in with a 10" albino O right now (temporary) and except for the occasional chase there are no problems, except that it is a little difficult to feed the con. What size tank are they in now?
 
Not a very good idea IMO...the oscar will continue to outgrow the cons and most likely eat them. & down the road the cons (if male and female) will breed and will be aggressive/defensive against the oscar, only to get eaten/hurt/killed.

Oscars temperaments do vary from one another, I've seen/heard of mean oscars, and I've heard of gentle oscars...so you may get lucky.
 
I have a pair of Pink Cons in my Oscar Tank. Nothing like seeing a 3-4" Male Pink Con Punk a 10" Tiger Oscar.... Funniest thing I ever seen.

Mike

Edit: I've read a few of the other posts, and wanted to add. The Cons tend to flare and strut in front of the Os and when the Os rush the Cons dart away, Break line of site and come back from behind. Don't underestimate the Cons speed and determination to stay between the Os and their Nest... That being said, I've had 4 batches of Con Fry in my O tank and I only have 2 FG Cons. The babies just don't last. Whether it's the hidden Marmokrebs that are in their. The Danios or the Os picking them off. They just don't ever get over 1/2"

Mike
 
Welcome to the site, you should be able to tell if the cons are male and female by their colors. The female will have an orange belly. If they are a pair you may run into problems down the road. Breeding cons are very aggresive and may not work with an O down the road. Like stated before hiding spots are a plus, I have a female con (about 2 inches) in with a 10" albino O right now (temporary) and except for the occasional chase there are no problems, except that it is a little difficult to feed the con. What size tank are they in now?

I've got around the feeding issues by feed Pellet. The Cons dart around behind the Os in the School of Danios eating the crushed pellet the Os spit out of their gills.
 
Welcome to mfk, I'm sure you will enjoy it. I've always liked convicts they are just an interesting little fish

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