I bought this rainbow a while ago as a dwarf neon, it was very silver at the time but has coloured up to an orangey sheen - it's obviously not a dwarf neon, but I can't find out what it is (bottom of picture)
I see 2 species of Rainbowfish in the pictures. One is of the Praecox (Neon dwarf Rainbowfish), the other Melanotaenia parkinsoni (Orange Rainbowfish). Both would need a school of 6 of their own kind unless the tank is going to be all Rainbowfish species, then you can get away with less.
Thanks, I think you may well be right. Yes the stocking list I have is correct so I'll be sure to try and pick up some more next time I'm at the fish shop. I'm looking forward to see if he colours up more as he ages, he is already pretty unrecognizable from the skinny silver fish I bought a few weeks ago.