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Do you have any idea what kind of tetras you have? Could they be Congo tetras? If they are then need to be in a school, as most tetras do...they are lovely fish and shouldn't be aggressive, if kept in a proper school.
As for discus, they are really hard to keep in a community tank. They need a "deep" tank, and one that is a minimum of 30 gallons, I am sure this would be WITHOUT any other fish.
The thing about discus is that they need warmer temperatures than most fish thrive in, AND have to have pristine water conditions. Most people do not want to invest the amount of money necessary to feed TOP quality food, or do as many water changes as required to keep nitrates down to 5.....Many people also use RO water filters, which is added cost.
I don't usually discourage people from expanding their interest areas, but unless you are financially prepared, these fish can be heart breakers....
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