Strange and Ugly fish

My colleague bought a UGLY fish in the fish tank. That's a cleaner fish. I screamed when I saw it in the morning (I checked with the fish tank everyday). It is SO UGLY. Its color is so pale and dull..... and its belly is semitransparent. I can see his mouth keep moving......
It STICK on everywhere too!!!!!!!!!!!! I think it's SO DISGUSTING!!!!!!!!!
HOWEVER,
This cleaner fish worked VERY HARD!!!!!! The tank is completely CLEANED immediately. It ate all the dirts in the water.

This cleaner fish is now STICKED under the small temporary tank of the baby fishes.
Can you imagine that if you're one of the baby fish here
where there's a fish that stayed underneath?