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Learned from others. I first thought that they would go in a 55 gallon.

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i think that 120 gallons minumum is a bit over the top. im not going to reject yet, but im pretty sure 75 gallons would be a much better minimum.

Hmm tricky one.Im sat here looking at a 55 gal thinking...yeah I probably could keep an adult oscar alive in that.It might not be happy, but it would live, especially if you had a large filter and decent aeration, but youd have to do a lot of water changes. A 75 would be better of course, totally doable but hardly luxurious. A 120 is nice and I'd choose to go for that, but is 120 a minimum? I know cal usually makes sense in the forums and i'm all for giving fish big tanks but im really torn here.Im pretty sure more than one oscar could go in a 120, I mean sure, its a big fish, but it isnt a giant gourami, its a 1 foot fish, and one specimen hasnt really got anything to be territorial about, and most plants will be torn up anyway so their isnt much intrusion into its personal space....major consideration is trying to keep the water changes to about 20% or less so youre talking a fish with a mediocre metabolism.. but it is primarily a predator given the choice, and that means nasty poo full of ammonia when it breaks down.......and surface area is negotiable depending on the equipment you have... water has to be clean to avoid hexamita....15-20 gal water swapout per week...at least a five to six footer to be humane for swimming space...

Settle on 90 - 100 gal and call it even for a full size adult with no cagemates?

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IMO just saying "a very large tank" is sufficient. none of the other profiles (at least none I've read) have an actual size mentioned as a minimum.

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This is precisely the reason we dont list minimum tank sizes, no one can agree.