Thanks Nandi and Pat, I did think of starting a worm farm some time back...unfortunately, the idea was vetoed by my wife...I'm not allowed to keep worms in the house
Sourcing for the worms is also another problem. Singapore is a very built up city, and most of the population lives in high rise flats = no backyards. Parks are all government property so we're not allowed to go dig around for forms (assuming we can even find the right type! For my discus I want red wrigglers not nightcrawlers). We're not allowed to import such livestock in either without a permit.