That's some pretty awesome softer water if you're asking me
Alkalinity is you KH and in degrees of hardness that's 4.5KH in your case with a pH combo of let's say 7...there's a lot fish that will love that:
Gourami's, Ram's, all sorta Tetra's, Danio's, Livebearer's (only recomannding males here, otherwise your tank will be overpopulated in NO TIME). There's really a ton of options with this water.
Also if you'd rather have small cichlids you could harden up your KH with crushed coral or dolomite, which will then also up your pH (you will never just adjust 1 parameter w/out the other 1)
So uhm yea...really the question is now WHAT DO YOU LIKE??
I'd figure out what fish you like, discuss them here or research by yourself, which ever you prefer, just make sure you know what you're getting into before buying it