Keyhole Cyclids In Community Tank

[DanielG]

Hi

I have a 34 gallon tank, planted with a sand substrate with the current stocking,

1 x Male Betta (dark blue)

10 x Cardinal tetra

7 x Cory catfish (black/white)

I want to add a couple of other fish to swim all levels as the tank looks a bit bare, someone told me that keyhole cyclids are very chilled out cyclids and that a pair of them could join my tank.

I am looking for some more colour as my fish are all bluey and dark colours, if you dont think keyholes would be suitable does anyone have any suggestions what i could get?

Thanks