As attached, picture shows it moving in a downward direction.
These buggers are less than 1mm in size. In massive numbers, the fish's skin pale out and seemed to be consumed. Hypo does not works...
Worm 1.bmp
Worm 2.bmp
Somehow, i find it similar to fluke trematode...
http://www.aquarium-pond-answers.com/2007/03/trematodes-and-nematodes-in-fish.html
http://www.fish-as-pets.com/2007/09/monogenean-parasites-marine-fish.html
Hope someone can help...
Last thing i wanna do is to flush out everything n restart...