What Shall I fill My 120G FW tropical Tank with

[DALE123]

I currently have a 120G Tank, containing :
1x Pleco
12 x Guppies (Babies thou about 2 cm )
A have one medium size rock
and a Medium plant

 

[BigJim]

Let the guppies do their thing and you'll have a full tank in about a year.

Seriously now, I'd start by adding a lot more plants, then add a big school of some flashy fish. Hengel's rasboras are a stunning orange and would look incredible against a lush green background.