As an aquarium hobbyist in Malaysia, I am sure that you have heard about tubifex worm or "cacing merah". Tubifex worms are common live fish food in this country.
Tubifex worms in fish shops are mostly collected in the wild. They must be kept in clean water for few days before being used as fish food - wild caught tubifex worms might carry diseases or parasites that could be fatal to fishes. You could often see aquarium shopkeepers cleaning their newly received tubifex worms like mad (wo)men, but if you buy your worms from irresponsible shopkeepers, you may bid your fish farewell.
Aquarium hobbyists are advised to clean any tubifex worm that they purchase to prevent any "accident." This could be done by keeping the tubifex worms under running water for few hours or by changing their water every three hours.
We do sell frozen dried tubifex worms instead of live ones! Click Our Product for more information!