you could put a single green terror in there and a bristle nose pleco , could be fun, but here is another stock which could be fun :
1x blue gourami
10x Cardinal Tetra
6x corydoras(any kind)
and maybe a bolivian ram with them ?
2 angels, 7 panda corys, 8 harlequin radboras or 8- 2" schooling fish
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You mentioned your tank has been "filtering" for a month and a half, but is it cycled? If it's empty there is a good chance it isn't. I wouldn't even consider GBR's at this point regardless. Once you're good to go, you can't beat a large school of cardinal tetra's with a couple of other larger fish. I have angels with mine. However cardinal's are known to be sensitive so they'd need nice parameters. Good luck!