I used to have a severum in with my oscars. They bullied him and he hid all the time. Oscars are bossy but really poor fighters, lol. I moved the severum to my angel fish tank and it's worked out great. I have a firemouth in a tank with 2 oscars now. No issues at all. The fm is tougher. Convicts and jack dempsey are good mates. On those big fish its good to figure about 35 gallons per fish. So, let's say 2 oscars, a jack dempsey, a fire mouth, and 6 silver dollars would be heavy stocked for example. A convict in place of the jd would be a little lighter
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