help me set up my saltwater theme fresh water tank ( its a challenge for me and you )

yes i measured it wrong, sorry , it is 22.47 gal . i post it for this tank,
i just looking for just a pair of fish that looks like salt water clown fish for the 22 gal tank, like nano reef but freshwater (2ft long x 1 ft width x 1.5 ft high)
but you know i already have Malawi m bunas in my main tank, just with some sand, which is big enough for them i think (4ft long x 1.5 ft width x 1.5 ft high )
it nothing can found or work out for the small tank , i will make the small tank planted tank with rummy nose tetra or cardinal tetra
and for the big tank Malawi m buna with fake corals saltwater theme cichlid tank
 
i think you are right, if i already have a big tank i should go for it
ok the tank i mentioned before is too small right
then what about this tank ? (4ft long x 1.5 ft width x 1.5 ft high ) 67.42 gal with saltwater theme ? i mean fake corals ?
by the way please suggest interesting but cheap and hardy fish for this tank
for example :-

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