hahaha...i normally get mine from jirh or pasir ris farm...
maybe that time something wrong with the water...
after leaving the water for alone for sometime(with occasional monitors), the fishes and corals seems healthier and have more coraline on my rocks now.
I think moorish idol also depends on ur luck, not every specimen can survive. like there is no standard formulae...
haha...
Will update with pictures soon..
Hope urs can survive too...i saw my friend keeping his for many years...a real beauty...