So Fish Fingers....while this has been going on I hope you have been cycling that 5Ftr
I would suggest a colony style tank
Nice dark sand some rocks...plants or not depending on what you want to keep?
There have ...between the pointed stick bits some good suggestions...mostly mine of course but others have contributed...
Maybe you could go to an arro but you might be better looking at some nice Africans...tangs...Tropheus and Calvus about 20 and 10 would be a nice mix or Fronts?
Then there is a mix of Haps...big colony of Proto's with some cats..or a single speices aulanocara tank with dolphins and cats and the like. Or you could use Mumbuna like yellows and zebras and Labeotrophus.
Crikey a tank that size...salvani, Festivums or some nice severums or GT or Texas...My favs Chocolates...or Firemouths with Geophagus and fire eels and cats .................The Choice is endless
If you were really keen ( fanatically stupid read that as, cause I NEVER have luck with these blardy fish) you could plant up and have a big school of discus or angels with some rams or the like...very nice display that way.
Will these tanks be display ...or procreation tanks?
HTH