Largest fish for a 12.5 gallon?

[VladVenger]

As an alternative to usual set ups im also interested in maybe getting 1-2 larger fish. Tank will be planted.
Anything you could reccomend?

 

[Hunterprey]

Perhaps a dwarf Red gourami

 

[fluttermoth]

What are the dimensions of the tank?

What are the hardness and pH or your water?

 

[VladVenger]

What are the dimensions of the tank?

What are the hardness and pH or your water?

15"x14"x14"

PH is around 7.2
Hardness: (from water supplier)

264.5 mg/l (or parts per million) :Calcium Carbonate
105.8 mg/l (or parts per million) :Calcium
18.409 °C Degrees Clark
26.45 °F Degrees French
15.024 °dH Degrees German
2.645 mmol/l :Millimoles