Oscar, texas and a midas????.

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In a 100 gallon tank I would have one or the other, not both. In your case I would put the fish in your avatar in that 100 gallon, instead of the 55 gallon you have planned for it, and scrap this idea altogether.
 
^^^^ Lol!, sure, that in case I already had bought that 100 gal but Im just talking about an hypotetical situation for a possible future setup mate.
 
There's no telling with any real certainty how any mix of cichlids is going to work out long term. In other words, as far as potential aggression levels go there's no definitive answer. Sometimes things work, and sometimes fish get dead.
 
I know im gonna get crap for this but.....i have for years everytime i set up a large monster tank. ive always bought my stock small and they grown to full size together and never killed or mauled another one. so yes i am one of the believers that raise them together and you have a better chance to keep ur full stock. now in my 125g i have all three of those fish, a 7" red oscar a 8" texas and a 6" midas and a 3" midas. i have never had any issues. occasional chasing but i can show you pictures of them all they are all big healthy intact and not a scratch on them. i actually raise the oscar and the midas from 1". i added the texas at his current size, hes actually trying to breed with the midas right now. will this scenerio work for anyone probably not but im just saying out of experience it can be done. and given the oppurtunity i would add those three fish together again. aggression wise i would say ur fine, tank size i would say u need to upgrade in the future.
 
I would say it would work, as long as they are the same size when you First put them in the tank. And in my given experiences, putting them in at the same time is crucial if they are going to be different sizes in the future. I currently have an 12in Oscar and and a 10in Oscar and a 6in Green Terror, they have grown up together and have never gotten into anything severe. And Every time I put another fish in the tank, no matter what I do the biggest Oscar and Cichlid find a way to kill them. And this has also happened with all of the Oscars I've had in the past. So I personally Strongly agree with the whole "raise them together" thing is very important. But it's your call If I were you I would go for it, and if worst comes to worst separate them.
 
woofy - "now in my 125g i have all three of those fish, a 7" red oscar a 8" texas and a 6" midas and a 3" midas. i have never had any issues."

^Ok, it may work and I may be wrong in the end but in this group the midas are still very young and small compared to the others and I think you may have some issues as they mature. My guess is the texas will hold it own pretty well but your oscar will get bullied.

CichlidMan416 - "I currently have an 12in Oscar and and a 10in Oscar and a 6in Green Terror, they have grown up together and have never gotten into anything severe."

^Oscars tend to do pretty good with other oscars, a little bullying but not much compared to how other fight go. The green terrors tend to be passive aggressive more, and defend themselves and even chase another fish away if they get picked on, but won't bully much. I see this as a tank that could work well for quite a few people, especially if all are raised from 2 inches or so together.

I have had both oscars and green terrors before separate from each other but with other fish. I kept my oscar in with a couple blue acaras and a keyhole cichlid, along with some blue and gold gourami and they were fine. I currently have my male green terror in with 4 blue gourami, two albino cory cats, and two syndonis featherfins and the only chases in that tank are the syns chasing eachother and the cory cats racing around on the bottom.
Instead of trying to mix a bunch of big cichlids together you may want to consider a dedicated pair, like a pair of green terrors, and then some large 'dither' types, gouramis, tinfoil barb, I have had a school of tiger barbs in with my green terrors and they do well, parrot cichlid, a school of silver dollars, pictus cats, etc. Even when my green terrors bred they didn't beat up anything in the tank, just chased them away about a foot. Just some thoughts.
 
I know im gonna get crap for this but.....i have for years everytime i set up a large monster tank. ive always bought my stock small and they grown to full size together and never killed or mauled another one. so yes i am one of the believers that raise them together and you have a better chance to keep ur full stock. now in my 125g i have all three of those fish, a 7" red oscar a 8" texas and a 6" midas and a 3" midas. i have never had any issues. occasional chasing but i can show you pictures of them all they are all big healthy intact and not a scratch on them. i actually raise the oscar and the midas from 1". i added the texas at his current size, hes actually trying to breed with the midas right now. will this scenerio work for anyone probably not but im just saying out of experience it can be done. and given the oppurtunity i would add those three fish together again. aggression wise i would say ur fine, tank size i would say u need to upgrade in the future.
Even if they do get along(not likely).They will need a lot more space and the bio load will be more monster than the fish LOL. They are still pretty small.
 
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