The two small stripey rainbowfish are McCulloch's Rainbowfish (Melanotaenia maccullochi). The larger one in the centre looks like a not very colourful blue rainbowfish/ Lake Kutubu Rainbowfish (Melanotaenia lacustris). The very blurry rainbowfish below it is possibly a species of banded rainbowfish, such as Melanotaenia trifasciata, but it is very hard to tell and the shape makes me believe that it is not.
There is a fourth species, with blue eyes below the maccullochi - I guess it's a Psuedomugil species, but I have no idea which.
Incidentally, I only know one fact involving the rainbowfishes: one of the most beautiful sites on the web is Home of the Rainbowfish - which features absolutely breathtaking photography.
