Could I Add Anything Colourful?

[damanax]

Hi all
 
I've got a 55g tank that I've recently converted to sand. My stocking was totally fine for when I had gravel but now that I've switched to white sand it's harder to see a few of the fish, especially the albino cories (this was totally expected though). I'd really like something with a bit of colour if possible.
 
Current stocking is:
1 Angel
11 Rummynose Tetra
7 Albino Cories
 
It is planted with a sand substrate and a few bits of driftwood but there is space to add a few caves/plants if I need to.
 
I like Bolivian Rams but I don't think they work with the rest of my stocking. 
 
Any suggestions?

 

[techen]

Uhhh, Looking at your stock, Get a Bristlenose plec or two, They come in different sizes and colours. Work well with Corys.
 
Also, you can emperor tetras, Card tetras and a few other tetras. All would work.
Also, paint the back of your tank black? Brings out fish colours better.

 

[the_lock_man]

If it were me, I'd get a smallish shoal of cardinal tetras. You can't get much more colourful than them.

 

[damanax]

The LFS here unfortunately doesn't stock Plecos or Cardinals. No idea why. Custom orders are also ridiculously expensive which limits what I can get 

 
What kind of other tetras would possibly work?
 
Back of the tank is already black