You could do a ckf but make sure that the fish you already are at least 3 inches
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What is a CKF?
I think 70 gallons is good for 1 Oscar.Heck yeah they need a 100 gallon....
IF you drop the shark 1 Jack Dempsey electric blue or regular would be one of the biggest fish you could keep in that tank.
jd's inc blue, green terrors, parrots and severem can get to 12inches... how wides the tank 12inch. if you plan on upgrading the tank tho they all take years to hit full size. salvini 9inch max, convict 6inch, maybe but are mean. keyhole 6inch, rainbow 5inch, firemouths 8inch, tbars 5inch, are a better choice imo. goodluck.