50 gallon reservoir fish!?

Hey, I am upgrading from my 10 gallon tank to going on for a 50 gallon tank, im not sure something like the amount but around there. I with the sole purpose know fish that belong in smaller tank. So could anyone help me out next to some good and interesting fish to use surrounded by my new cistern?
Answers: 5 ranchu goldfishes.
Yeah, you could still use the small fishes, but you could also get an Oscar for it. Just manufacture sure the Oscar has vastly compatible fish with his side, small fishes are NOT COMPATIBLE.

Cichilds although i know completely little of them because i like smalls tank:)

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