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Re: introducing new oscar with old oscars??????
The reason that you are having issue with that many fish in any tank is going to be an issue. The minimum for 2 Oscars is 75 gallons. The general equation is 55 gallons for the first Oscar, and 25 gallons for each one after that. Now, with the JDs, I would say you are better off with two tanks, a 125 (Oscars) and a 40 (JD).
Understand that Oscars and Dempseys need a large amount of space, and the more space you give them the happier they are, really.
For example, I have 1 Oscar in a 55 gallon, and once I move next summer, I plan on getting him a 125 gallon tank, and his tankmate is and will be a pleco.
It's up to you, but I wouldn't put that many fish together that are that size.
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