hey ive got a 4foot 55 uk G and was wondering if tiger barbs would go well as dithers with Jd, convicts , jewels , salvini its well filtered just wondering because i got told on here Odessa barbs would work but ony 3 of the 5 have survived 
I have Tiger barbs in with my Pike Cichlids. I would say they would make great dithers for your tank, just make sure to get mature ones as they are larger.
Just try a few at first, i think a JD would kill and eat them later on, they have a pretty big mouth.
the colours dont matter, unless they are hybrids with Black Rubys, then they tend to be more docile.