Would just like to inform people of the cruelty these fishes are
subjected to gain these "cuteness" or "aesthetic-value" to it.
These include the common fishes we see in our local aquarium shops
and commonly sold as 'Painted Parrot Fish', 'Rainbow Parrot Fish'
(Shades of blue, pink, yellow, purple, green etc), Skeleton fishes
with bright neon strips, Tailess Luohan etc
Contrary to what the aquarium may tell you that these fishes are
actually breeded to look like that. Hundreds and thousands of these
fishes have to suffer for these cosmetic changes and many die from
the process. More often than not, their lifespan is also
drastically shortened.
The link below briefly explains the procedures of how it is done
It was originally an article found in a Singapore fish
keeping magazine 
http://www.practicalfishkeeping.co.uk/pfk/pages/item.php?news=957