tubifex worms ? yes long ago b4 we hv frozen mysis n brine shrimp, its either tubifex, blood worm, cultivate yr own baby brine shrimps or its shredded mkt prawn meat.... i used to feed tubifex or blood worm to entice finicky feeders to start feeding.. but not recommended nowadays as there are other foods readily available commercially... Reasons being nutritional values, parasites etc etc ...