Dither fish are used to coax scared fish or fish that hide. Dithers are used to get shy fish to come out. The basic theory is to ease the scared fish out of hiding by swimming around and showing it is ok to come out. You don't have the fish yet so you cant see if they are going to hide.Okay! I got it!
How about a JD Pair and some rainbowfish for dithers?
Sorry, I love just hypothetically dreaming about fish...
I would go with something a bit bigger. Maybe a couple or HRP's (Houndouran Red Points) or a couple of Herotilapia multispinosa (Rainbow cichlids)