Tubifex worms do not foul the water, contrary to what most people think. As Valice mentioned, they help aerate the substrate. They won't die if the water is good, i.e. oxygenated and clean (yes, the worms require clean water). But XnSdVd will warn you, do NOT use them with base fert. They will dig the fert upwards.
Do NOT fish out the khulis just to feed them. It stressed them further, pushing them to death's door faster...
Sometimes, there is no choice but to use live food. And tubifex is the only useful live food in this case. The loaches will not be so enticed to take the brineshrimp or bloodworms (which MIGHT work but they are SO much bigger...). It should not be a long term matter. They will start accepting other foods once they start eating. The worms are to motivate them to start eating.
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