Coming from Singapore too... I must state that unless one went to some exotic Mexican-Indian hybrid Seafood-Restaurant that I do not know of, the Chilli Crab is by no means a dish anywhere near the top of the tongue-shredding
scale of Capsaicin torture.
That said... the Chilli Crab dish
IS still spicy, so don't take it lightly if you're not used to chilli.
Cheers.